ENH: Added remove methods for legends in figure and axes objects
TST: Added tests for remove of legends on figure and axes objects
BLD: Replaced assert_is import from nose.tools in test_legend as python 2.6 does not support it
STY: pep8 fixes to test_legend.py
Merge pull request #2798 from cimarronm/legend_remove

Added remove methods for legends in figure and axes objects