Replace incorrect run_depends. Fix #4.
Prefix xacro macro with mfg name. Fix #2.
Change irb4400l30 mesh extensions to lowercase. Fix #3.

The ROS Industrial repository style guide (wiki) prefers lowercase filenames and extensions.
Remove 'solid' magic from binary STLs. Fix #5.
Merge pull request #6 from gavanderhoorn/issues_2_3_4_5

Fixes for issues #2, #3, #4 and #5