Documentation update in OALplus
Added a new OALplus example
Minor changes in Angle<T>

- used the OGLplus angle-related functions in OALplus.
Merge branch 'develop' into feature-boost-python
Minor update in OALplus Angle
Merge branch 'develop' into feature-boost-python
Minor fixup in Angle
Merge branch 'develop' into feature-boost-python
Fix of a warning in OALplus Managed<T>
Merge branch 'develop' into feature-boost-python
Update of Python bindings

- Refactored the registering of OGLplus
  - Vector
  - Angle
- Added registering of OALplus
  - Angle
  - Array
  - Listener
  - Vector
- Added a new example showing the usage of OALplus bindings
Minor fixup in the implementaion of OALplus Array
Merge branch 'develop' into feature-boost-python
Updated the Python bindings for OALplus

- Added registering of ALUT
- Updated registering of Source
- Fixed some problems in Array
- Added a new example