Modified Casava18ReadNameEncoder to correctly display filter status.  Previously it was treated as "passing filter" when in fact Illumina's intended meaning in the read name is "is filtered" (i.e. does *not* pass filter).  The enum for the field has also been renamed to more accurately reflect its content.
Don't commit the ipr file!!
Merge pull request #43 from broadinstitute/origin/kt_fix_fastq_pf_flag

Modified Casava18ReadNameEncoder to correctly display filter status...,