Update to version 2.0 for release

Bump version to 1.5, last version before 2.0 and C++11 enforcement

Add travis build status button

Add one example for partial dataset selection

Merge pull request BlueBrain#39 from BlueBrain/1_2_release

Prepare for release 1.2

Update documentation and add example for boost.ublas

Main features implemented, switch to 1.0 version