Added installation of boost development libraries
Removed Boost log dependency
Lowered Boost required version for Travis CI
Merge branch 'topic/logging' into topic/travis-ci

* topic/logging:
  Lowered Boost required version for Travis CI
  Removed Boost log dependency

Conflicts:
	CMakeLists.txt
Removed clang from Travis configuration
Merge branch 'topic/travis-ci'

* topic/travis-ci:
  Removed clang from Travis configuration
  Lowered Boost required version for Travis CI
  Removed Boost log dependency
  Added installation of boost development libraries
Don't check revision of Boost