added sequence, coding sequence, and UTR properties to Transcript objects
consolidating scattered unit tests, added missing strand param to different queries
renamed memory_cache to compute_cache, added pickling cache called cached_object
remove _on_contig methods from README, filled in a few of the missing arguments
added more transcript unit tests, dealing with spliced and unspliced offsets separately
added docstring to Transcript, added data module for tests
deleted memory_cache module
don't use elif after return
small renames, use compute_cache instead of memory_cache in __init__
use highest protocol for pickling
more comments in trickier code sections of Transcript, make sure codon spliced offsets are contiguous
version bump
Merge pull request #19 from hammerlab/reference_sequence_on_transcripts

added sequence, coding sequence, and UTR properties to Transcript objects