Make "CT" aux tag defined in bam_mate.c "ct" because it conflicts with existing defined CT tag.
Fix typo; fixes #85.
Merge pull request #91 from mp15/fixmate

Lowercase fixmate's CT tag pending permanent solution
Check return status of IO calls to prevent gcc 4.6.3 warnings
mpileup: Detect non-recoverable errors and exit with proper status
stats: Fixed off-by-one error in GCD stats which overestimated GC content by 1 part in GCD bin size
Merge branch 'develop' into calling