gs_data/isc_viewer:

Added styles to isc_viewer.
fabfile:

Changed the way we do geoserver api calls with files. Before,
we were just reading the content as a big string and curling it.
This errors out with big files. Now, we use the @<file> notation
and it works better.
fabfile:

Re-worked the isc_viewer app load procedure to include layer styling.
Merge pull request #73 from larsbutler/isc-styles

Dev bootstrap script: isc_viewer styles

[r=nastasi-oq] [f=1223708]