Warnings with -Wall fixed
Merge branch 'develop' of https://github.com/opencb/hpg-libs into develop-2.0.1-beta
region.is_valid_chromosome receives the number of chromosomes as an unsigned long, for those cases with an undefined number of contigs
Merge branch 'develop' of https://github.com/opencb/hpg-libs into develop-tmp
Memory leaks removed in file_utils and vcf_stats
Merge branch 'develop' of github.com:opencb/hpg-libs into develop
Support for aggregated VCF files. Closes #11
Fixed bug in Sconstruct when changing compilers.
Merge pull request #16 from jmmut/develop

Fixed bug in Sconstruct when changing compilers.
Merge branch 'jmmut-feature/cplusplus' into feature/cplusplus. Resolves #17
Added support to read bgzipped files ( #14 )

It uses htslib.
Basic reading of plain VCF file and call to Ragel state machine
First version working with a full file
Some parsing rules flattened, and method 'parse_line' renamed to 'parse'
First version of configurable parsing and validation: ignore or store errors, stop or continue after one error is found
Support for aggregated VCF files
Entries added to .gitignore
First custom messages for some fields
New rules for the VCF parser:
* INFO meta entries
* Distinguish between key-value and value-only meta entries
Rules for valid meta ALT, FILTER, FORMAT and INFO. It must be fixed that if one of them is not valid it goes to the generic