Refactoring to get rid of mask files

[yhoogstrate]

• [x] Enable Travis
• [x] Test flaimapper itself
  • [x] Test different -p files and results
• [x] Test converters and additional scripts?
• [ ] Refactor structure of FragmentFinder class
• [ ] Coveralls
• [x] Use logging
• [x] Throw exceptions
• [x] Have possibility to use custom matrix
• [x] Use clever region system to avoid using Mask files, and update CLI
• [x] s/\t/ /g
• [x] Drop samtools dep. and index bam files with pysam
• [x] Create FlaiMapper.Data and let the installer put important data files into pkg_resources
• [x] Drop cumbersome file formats
• [x] Update readme
• [x] Update changelog
• [x] Add extra lines to GTF (type exon)
  • [x] Plus two arguments --offset5p=4 --offset3p=4
• [x] push to pip
• [x] push to bioconda
• [ ] deploy in iuc