House meetings

The house_meetings_branch is now seeking out all the witness information and all the documents mentioned in the meeting XML. 

It is working for me locally and incorporates the feedback from #128. I am happy to hear additional feedback. 

The meeting information is saving the new files the following structure outlined below. The numbers are the house event ids.

```
data
└── committee
    └── meetings
        └── house
              ├── 100139
              │   ├── BILLS-113hr_297ih-U1.pdf
              │   ├── HTMG-113pih-ECRules113.pdf
              │   ├── HTMG-113pih-ECJurisdiction113.pdf
              ├── 101204
             │   ├── HHRG-113-JU03-Wstate-SherakW-20130725.pdf
             │   ├── HHRG-113-JU03-Wstate-MopiskE-20130725.pdf
             │   ├── HHRG-113-JU03-Wstate-HanstenT-20130725.pdf
```

Here is a sample of the json data it produces:
```
{
    "bills": [], 
    "chamber": "house", 
    "committee": "HSHM", 
    "congress": 113, 
    "guid": "1075f29a-e2dc-4413-9383-d41a1f1d9baf", 
    "house_event_id": 102200, 
    "house_meeting_type": "HHRG", 
    "meeting_documents": [
      {
        "bill_id": null, 
        "description": "Witness List", 
        "type": "SD", 
        "urls": [
          {
            "file_found": true, 
            "url": "http://docs.house.gov/meetings/HM/HM08/20140508/102200/HHRG-113-HM08-20140508-SD001.pdf"
          }
        ], 
        "version_code": "ih"
      }
    ], 
    "occurs_at": "2014-05-08T14:00:00", 
    "room": "CHOB 311", 
    "subcommittee": "08", 
    "topic": "\u201cElectromagnetic Pulse (EMP): Threat to Critical Infrastructure.\u201d", 
    "url": "http://docs.house.gov/Committee/Calendar/ByEvent.aspx?EventID=102200", 
    "witnesses": [
      {
        "documents": [
          {
            "description": null, 
            "type": "WS", 
            "urls": [
              {
                "file_found": true, 
                "url": "http://docs.house.gov/meetings/HM/HM08/20140508/102200/HHRG-113-HM08-Wstate-F000448-20140508.pdf"
              }
            ]
          }
        ], 
        "first_name": "Trent", 
        "house_event_id": "102200", 
        "last_name": "Franks", 
        "middle_name": null, 
        "organization": null, 
        "position": "Member of Congress", 
        "witness_type": null
      }, 
      {
        "documents": [
          {
            "description": null, 
            "type": "WS", 
            "urls": [
              {
                "file_found": true, 
                "url": "http://docs.house.gov/meetings/HM/HM08/20140508/102200/HHRG-113-HM08-Wstate-PryP-20140508.pdf"
              }
            ]
          }, 
          {
            "description": null, 
            "type": "WT", 
            "urls": [
              {
                "file_found": true, 
                "url": "http://docs.house.gov/meetings/HM/HM08/20140508/102200/HHRG-113-HM08-TTF-PryP-20140508.pdf"
              }
            ]
          }, 
          {
            "description": null, 
            "type": "WB", 
            "urls": [
              {
                "file_found": true, 
                "url": "http://docs.house.gov/meetings/HM/HM08/20140508/102200/HHRG-113-HM08-Bio-PryP-20140508.pdf"
              }
            ]
          }
        ], 
        "first_name": "Peter", 
        "house_event_id": "102200", 
        "last_name": "Pry", 
        "middle_name": "Vincent", 
        "organization": "Task Force on National and Homeland Security", 
        "position": "Congressional EMP Commission Congressional Strategic Posture Commission Executive Director", 
        "witness_type": "Non-Governmental"
      }, 
      {
        "documents": [
          {
            "description": null, 
            "type": "WS", 
            "urls": [
              {
                "file_found": true, 
                "url": "http://docs.house.gov/meetings/HM/HM08/20140508/102200/HHRG-113-HM08-Wstate-FrankelM-20140508.pdf"
              }
            ]
          }
        ], 
        "first_name": "Michael", 
        "house_event_id": "102200", 
        "last_name": "Frankel", 
        "middle_name": "J.", 
        "organization": "Penn State University Applied Research Laboratory", 
        "position": "Senior Scientist", 
        "witness_type": "Government - State"
      }, 
      {
        "documents": [
          {
            "description": null, 
            "type": "WT", 
            "urls": [
              {
                "file_found": true, 
                "url": "http://docs.house.gov/meetings/HM/HM08/20140508/102200/HHRG-113-HM08-TTF-BeckC-20140508.pdf"
              }
            ]
          }, 
          {
            "description": null, 
            "type": "WS", 
            "urls": [
              {
                "file_found": true, 
                "url": "http://docs.house.gov/meetings/HM/HM08/20140508/102200/HHRG-113-HM08-Wstate-BeckC-20140508.pdf"
              }
            ]
          }
        ], 
        "first_name": "Chris", 
        "house_event_id": "102200", 
        "last_name": "Beck", 
        "middle_name": null, 
        "organization": "The Electric Infrastructure Security Council", 
        "position": "Vice President, Policy and Strategic Initiatives", 
        "witness_type": "Non-Governmental"
      }
    ]
  }, 
  {
    "bills": [
      "hr-113"
    ], 
    "chamber": "house", 
    "committee": "HSAP", 
    "congress": 113, 
    "guid": "ad0bf86c-9c75-4b2f-896c-84cbb57809f5", 
    "house_event_id": 102201, 
    "house_meeting_type": "HMKP", 
    "meeting_documents": [
      {
        "bill_id": "H.R.", 
        "description": "FY 2015 Transportation, Housing and Urban Development Bill - Subcommittee Draft", 
        "type": "BR", 
        "urls": [
          {
            "file_found": true, 
            "url": "http://docs.house.gov/meetings/AP/AP20/20140507/102201/BILLS-113HR-SC-AP-FY2015-TransHUD-SubcommitteeDraft.pdf"
          }
        ], 
        "version_code": "pih"
      }, 
      {
        "bill_id": null, 
        "description": "Opening Statement of Subcommittee Chairman Tom Latham", 
        "type": "SD", 
        "urls": [
          {
            "file_found": true, 
            "url": "http://docs.house.gov/meetings/AP/AP20/20140507/102201/HMKP-113-AP20-20140507-SD002.pdf"
          }
        ], 
        "version_code": "ih"
      }, 
      {
        "bill_id": null, 
        "description": "Opening Statement of Chairman Hal Rogers", 
        "type": "SD", 
        "urls": [
          {
            "file_found": true, 
            "url": "http://docs.house.gov/meetings/AP/AP20/20140507/102201/HMKP-113-AP20-20140507-SD003.pdf"
          }
        ], 
        "version_code": "ih"
      }, 
      {
        "bill_id": null, 
        "description": "Notice of Subcommittee Markup", 
        "type": "SD", 
        "urls": [
          {
            "file_found": true, 
            "url": "http://docs.house.gov/meetings/AP/AP20/20140507/102201/HMKP-113-AP20-20140507-SD001.pdf"
          }
        ], 
        "version_code": "ih"
      }
    ], 
    "occurs_at": "2014-05-07T10:00:00", 
    "room": "RHOB 2358-A", 
    "subcommittee": "20", 
    "topic": "FY 2015 Transportation, Housing and Urban Development Appropriations Bill - Subcommittee", 
    "url": "http://docs.house.gov/Committee/Calendar/ByEvent.aspx?EventID=102201"
  }, 
```