Fix r_modular externalptr error
[travis] add ppa to dump swig version
fix for broken BAHSIC unit test on freebsd bot
Added a ppa with swig 2.0.7 to travis conf
Merge pull request #2479 from matthuska/r-externalptr-error

Fix r_modular externalptr error
Merge pull request #2480 from lambday/develop

fix for broken BAHSIC unit test on freebsd bot
Remove R job from allow to fail jobs on travis
since R modular interface is finally fixed! \o/
[ci skip]