Added frame image/style file export

Fixed some bugs in the base xml also.
Added missing frames

Informed @mepler that these frame files needed to be added (Land
Equipment and the symbol set 98 frame) so DISA's svg master will also
contain these.
Omit source file information from output

Added a switch to enable turning off the export of svg source file
information from image file exports.
Merge pull request #54 from abouffard/master

Added frame image file, name, category, tags export