API method setCenterLocation.

Convenience method to set the gene location directly at the center of
the browser.
Merge branch 'master' of https://github.com/dasmoth/dalliance
Merge pull request #119 from dlrice/master

API method setCenterLocation
Add "indexChunks" option to BAM sources.

This can dramatically speed up the initial load of Dalliance for large
BAM tracks with correspondingly large BAI files. For example, I have a
9MB BAI file. Loading this over the networks takes >20 seconds. But if I
specify indexChunks, I can just load a single chromosome on the first
view, which only requires fetching ~600k of BAI. This results in a
massive speedup.

Factor out index offset calculations

chunked test passes

Cleanup & fix

More cleanup
Only fetch BAM if BAI request succeeds

test case for failing BAI

whoops
Merge pull request #121 from danvk/index-chunks

Add "indexChunks" option to BAM sources
Only consume escape key events if a tool panel is open.
Add maxPixelsPerBase config option.
Fix glitch when multiple tiers request data from the same mapping.
Merge branch 'master' into dist
Update build