Started working on issue #42
Added createBlockMatrix method to Basic2DFactory (issue #42)
Added createBlockMatrix method to Basic1DFactory (issue #42)
Added createBlockMatrix wrapper to SafeFactory (issue #42)
Added createBlockMatrix method to CRSFactory (issue #42)
Added createBlockMatrix method to CCSFactory (issue #42)
Merge branch 'master' of https://github.com/SamoylovMD/la4j
Update CRSFactory.java

Imports optimized.
Code refactored (issue #42)
Merge branch 'master' of https://github.com/SamoylovMD/la4j
Merge pull request #83 from SamoylovMD/master

Added method for block matrix creation (fixes #42)