Implemented cbegin, cend, crbegin and crend to vector*.hpp files.
Remove cbegin, cend,... member functions that doesn't return a const iterator.
- Removed #endif pragma.
- Fixed the invalid name of member function.
Implemented cbegin, cend, crbegin and crend in matrices files.
Implemented cbegin, cend, crbegin and crend in storage files.
Merge remote-tracking branch 'upstream/develop' into develop
Merge pull request #7 from jdurancomas/develop

Implemented cbegin, cend, crbegin and crend member functions in matrices, vectors and storage.