tweak Alignment track display of insertions
fix my enbugging of Alignments track base mismatch display when zoomed way out
more work onthe way Alignments tracks draw mismatches
make BAM backend think more correctly about the sizes and locations of feature bytes, fixing enbugging in cfed4c5
rewrite how individual bases of alignment mismatches are drawn, and only draw bases for mismatches that are fewer than 20 bases (limitations of HTML performance)
add a .htaccess file to the JBrowse root directory that enables CORS
on all files under it.  will be more likely to catch BAM and BigWig files that people might put in it. closes #167
added track.showReverseStrand config variable to Sequence track that, if set to false, turns off display of the reverse sequence strand. closes #175.
style the colored basepairs in the sequence track, when zoomed in, to look like little mosaic tiles
wait even *longer* in selenium tests before clicking a track menu item
remove selenium tests from build process, they just are not stable enough
release 1.7.3
remove no-longer-used dep on Digest::MurmurHash
fix alignment deletion css
clamp the width of alignment mismatches to 1px at the lower end
give Sequence track a gray background behind the base letters, makes 1-pixel errors in layout at some zoom levels not so visible
make RemoteBinaryFile fail more cleanly if fetches have no data in them
make the Simple tracklist display the track label if the track key is not set
give calling code access to the total size of a remote file by setting a fileSize property on arraybuffers returned from RemoteBinaryFile
restore the dlog function in the bigwig store
fix BigWig bug with large numbers of reference sequences