osx: add Homebrew dependencies.
[travis] Synchronize.
[travis] Synchronize.
[travis] Synchronize.
differentiable-function.hxx: fix some types.
clang: fix some warnings.
[travis] Synchronize.
Update README.md
[travis] No longer allow failure for osx.
[travis] Synchronize.
[travis] Synchronize.
include/roboptim/core/filter/chain.hxx: fix guards
filters: fix some names.
Update README.md [skip ci]

Fix (repeated)  CMake link.
[travis] Synchronize.
modified for MSVC(Intel)
Update CONTRIBUTING.md
Merge pull request #64 from kayusawa/msvc-intel

Fix compilation on  MSVC.
AUTHORS: add Ko Ayusawa
problem.hh: add support for arguments names.

Close #46