proper Y axis labeling in spike_browser, #47
Travis: added hdf5-tools
Travis: define package versions
Travis: do not use requirements.txt
Travis: added cython
Travis: install pywavelets via pip
Travis: try agiain with pip
Travis: added numexprt and tk headers
Travis: more luck with mpl, added back cython
Travis: added scipy to requirements
fixed ylims in spike browser (closes #83)
Merge branch 'dev' into neo_support

Conflicts:
	requirements.txt
added sample Axon file