Squashed '.travis/' changes from 7a40a28..bad6dbd

bad6dbd Allow to specify pybindgen install prefix
3f214dd Update pybindgen archive url
f13ddca Use a common script for Eigen 3.2 and 3.3
0d26976 Add a script for Eigen 3.3
027bca4 Update Eigen 3.2 version to 3.2.10
629f539 ipopt: update to 3.12.6
87f7ee7 eigen: update to 3.2.9
a0c7e47 common.sh: fix OS X environment
811fbd6 Merge pull request #31 from francois-keith/dev4
4c8a74c Hard code the path to git.exe
8c1c5f5 Build in debug.
89d0b39 Add some intermediary checks.
c2f4554 [AppVeyor] Add a method to run the unit tests.
e59a441 Correct choco install.
af4c533 Merge pull request #30 from jcarpent/master
00d90b0 Fix bug in common.sh
9da636c Merge pull request #29 from jcarpent/master
dd15db5 Use CI_BRANCH instead of TRAVIS_BRANCH
448cc3f Set DO_*_ON_BRANCH to the current branch if they are not yet defined
c5ed776 [Cppcheck] Do ccpcheck only on specified branches
3c52bd1 [Coverage] Do coverage only on specified branches
2a03b5b [AppVeyor] Support for projects with fortran subdirectory
b819e8a dependencies: add missing -qq for apt-get
9b94f1a dependencies/ipopt: install dependencies with apt
7b21446 dependencies: add script to install Ipopt from source
211e163 Merge pull request #28 from gergondet/topic/Win32
8f7b969 [Win32] Add AppVeyor support
REVERT: 7a40a28 Update submodule before building
REVERT: bc0a72e [Win32] Solve an issue in functions
REVERT: 99d898d [Win32] Add AppVeyor support

git-subtree-dir: .travis
git-subtree-split: bad6dbd29cf70e852e5e427e876390d954ca7d6b