allow multiple params to flow from URL to rptrender

### Usecase 1

`https://shackbarth-470-dev.localhost/demo_dev/generate-report?nameSpace=ORPT&type=AddressesMasterList`

will map to 
```
[ '-display',
  ':17',
  '-close',
  '-h',
  '/var/run/postgresql',
  '-p',
  5435,
  '-d',
  'demo_dev',
  '-U',
  'admin',
  '-pdf',
  '-outpdf=/home/shackbarth/git/xtuple/node-datasource/temp/demo_dev/addressesmasterlist.pdf',
  '-loadfromdb=AddressesMasterList' ]
```


### Usecase 2

`https://shackbarth-470-dev.localhost/demo_dev/generate-report?nameSpace=ORPT&type=AddressesMasterList&param=1`

will map to 
```
[ '-display',
  ':17',
  '-close',
  '-h',
  '/var/run/postgresql',
  '-p',
  5435,
  '-d',
  'demo_dev',
  '-U',
  'admin',
  '-pdf',
  '-outpdf=/home/shackbarth/git/xtuple/node-datasource/temp/demo_dev/addressesmasterlist.pdf',
  '-loadfromdb=AddressesMasterList',
  '-param=1' ]
```

### Usecase 3

`https://shackbarth-470-dev.localhost/demo_dev/generate-report?nameSpace=ORPT&type=AddressesMasterList&param=1&param=2`

will map to 
```
[ '-display',
  ':17',
  '-close',
  '-h',
  '/var/run/postgresql',
  '-p',
  5435,
  '-d',
  'demo_dev',
  '-U',
  'admin',
  '-pdf',
  '-outpdf=/home/shackbarth/git/xtuple/node-datasource/temp/demo_dev/addressesmasterlist.pdf',
  '-loadfromdb=AddressesMasterList',
  '-param=1',
  '-param=2' ]
```