Merge pull request #308 from weese/hotfix/fix-vs12

[FIX] removed VS12 ambigous bug
Merge pull request #310 from weese/hotfix/snp-store

[FIX] simplified some math and conversions
[FIX] Disabling Mason2 in Visual Studio <10

Somehow copy constructors are not properly called with 64 bit binaries.  32 bit binaries are fine.
Merge pull request #314 from holtgrewe/hotfix/disable_mason2_old_vs

[FIX] Disabling Mason2 in Visual Studio <10
[FIX] fixed broken CMakeLists.txt
Merge pull request #315 from seqan/master

Merging master into develop.