Updating digital normalization prior to velvet-oases assembly on antlab. Added general scripts (some linked from khmer/scripts) to general scripts directory for working with fastq files
Re-organized and modified scripts for transcriptome assembly to perform digital normalization
prior to merging reads and then assembly.

Three workflows

1) trim - assemble (on mason branch merged with master)
2) trim - diginorm - assemble (on transcriptome branch)
3) trim - diginorm - merge overlapping reads - assemble (on transcriptome branch)