Capitalize "cross" to be consistent with the rest of the names

Capitalize "cross" to "Cross" in order to be consistent with the rest of
the names
Update ArcGIS styles to latest version (camera icons etc)

Update ArcGIS styles to latest version. Now includes vector, retina, and
representation versions
Update documentation to reflect latest ArcGIS styles

Update documentation to reflect latest ArcGIS styles and the utility
used to create them
Merge pull request #119 from williamscraigm/gh-pages

Update ArcGIS styles and documentation