splitter gives non-intuitive message when handed only compressed fastq files

[janders3-nmdp]

Another check should be added so that if it finds only fastq.gz files, it warns that said files need to be gunzip'd. Or, perhaps it could try to gunzip them itself?

[janders3-nmdp]

77 might be considered to fix this, as the regex is smarter now, and will exempt any file ending in .gz or .bz2

[janders3-nmdp]

77 now prevents splitter from running when handed only compressed .fastq or .fq files.

This isn't a perfect-world fix, but does follow the letter of fixing issue #29.