log ROOT version on the debug stream
delete allocated trees in attempt to suppress memory leak
import expand as expand_path
Merge pull request #297 from ndawe/master

Fix #296
Merge pull request #294 from ndawe/debug

Delete TTrees after use in root2hdf5 to fix "memory leak"
x = File.Get('x') keeps File alive as long as 'x' is alive (+ test)
Add test that root_open('x').Get('y').Draw() has desired lifetime
Merge pull request #299 from pwaller/get-keepalive

x = File.Get('x') keeps File alive as long as 'x' is alive (+ test)
fixes for log-scale y axis
rm ForceStyle and use actual style and not its name in preserve_current_style
minor changes to the ATLAS style
add Line and use post_init
respect gStyle line widths and marker sizes, and scale line width in conversion to matplotlib
don't include canvas window manager decorations in canvas size by default
fix mpl example
fix for setting canvas size in batch mode
FIX fill_between
add step function to root2matplotlib
clean root2matplotlib
root2matplotlib: improve automatic plot range setting