Update python-dateutil version to 1.5 for Python 2.x support.  fixes #73
fix warning to not exit (#74)
CSW GetCapabilities should be HTTP GET (#76)
Merge pull request #77 from tomkralidis/issue-76

CSW GetCapabilities should be HTTP GET (#76)
GetRecordById should be HTTP GET (#78)
An ISO19139 metadata file can contain various Extent elements - Fix #72
both gmd:extent and srv:extent may have multiple instances
extra line
Merge pull request #82 from severo/issue72

An ISO19139 metadata file can contain various Extent elements - Fix #72