init commit: prepare Takeda samples to get gene symbols.
Accepts both GERP scores or phastCon scores.
Rotate text 90 degrees for uniprot plot. Makes text larger.
adjust label text. 

Added plot density function (mostly for exon length usage)
Now can run in both "gerp_score" mode as well as "phastcons" mode, with
phastcons fixed so that it checks each line to see if there is an
"offset" which would mess things up before. Now bug is fixed.
Added threshold as user defined.
Added density plot to show distirbution of scores compared to null.

Added plot functions for density plot. Fills nicely now.
Calculates background gene list matches explicitly.
hlines now does not repeat labels.
density plot has option to not show plot
init commit: plots motif distibutions in the gene
compares input lenghts for anchor. useful for checking bias
no grid for uniprotplot
reduce linewidths, change colors to match xenograft model motifs