another speedup attempt for index.html: carousel images to use thumbnails instead, 1 blocking js removed for page (sidebar.js)
cleanup changes
remove paren
add lossless image compression for docbuilding machine
switch species_kde to thumbnail
logo lossless compressions
add coverage test for travis
coverall added
remove whitespace, fix pip install
Merge pull request #2500 from ndawe/r2

[MRG] AdaBoostRegressor: fix redundant recalculation of error_vect.max()
Merge pull request #2495 from jaquesgrobler/ENH_coverage_travis

add coverage test for travis
ENH: Call plot twice per class label rather than for every point.
ENH: remove offset calculations
ENH: use memset and memcpy when possible
ENH: make sort an inline nogil function
ENH: make node_reset/split/value gil-free
ENH: use npy_int32 type
Merge pull request #2487 from jaquesgrobler/DOC_speed_up_frontpage

another speedup attempt for index.html:
Cosmit: move log_loss.
ENH: Call plot twice per class label rather than for every point.