NEW: script to plot histograms of SPGR data in CSF, cord,...
REF: changed flag -p for flag -t
DOC: changed usage on sct_register_to_template.py
Merge branch 'master' of github.com:neuropoly/spinalcordtoolbox
DOC: updated usage to reflect flag change
TEST: updated test to reflect flag changing
REF: change flag -p for flag -t and add flag -p for registration parameters (number of iterations, algorithm, gradient step, metric).
Merge branch 'master' of https://github.com/neuropoly/spinalcordtoolbox

Conflicts:
	scripts/sct_register_to_template.py
OPT: check existence of testing data folder
DOC: improve usage()
REF: trying to merge...
Merge branch 'master' of https://github.com/neuropoly/spinalcordtoolbox

Conflicts:
	scripts/sct_convert.py
DOC: update usage
REF: removed extension in sct_convert to avoid problem when script is not in PATH
BUG: fixed bug on method calling
BUG: fixed error in variable name
REF: now check if minctools are correctly installed
INST: new installer for developers
INST: fixed bug on os path
INST: fixed bug on bashrc