Merge pull request #3 from maxime-esa/master

Improved Generic and Python backends
Merge pull request #4 from maxime-esa/master

Updated XML backend
Updated link to manual
Merge branch 'master' of github.com:ttsiodras/asn1scc
Added the coverage-checking test cases.
No need for GCC-4.7 specificity.
Merge https://github.com/ttsiodras/asn1scc