remove explicit use/requires of PerlIO::gzip.  not necessary, and might allow some people with broken perls to run without it.  references #391
Fix sideways scrolling in Firefox on an decent trackpad
tweak scroll speed
Add OSX dependent multiplier to fix horizonal scroll bug on Firefox + OSX 10.9
Make check 10.9 specific
Merge branch 'firefoxscroll'

Conflicts:
	src/JBrowse/GenomeView.js
Merge remote-tracking branch: upstream/master