ERT-211 Added python classes to fetch gen_kw keywords
ERT-211 Updated key word filter functions to use a popup and added support for gen_kw
Merge remote-tracking branch 'upstream/master' into gen_kw
ERT-210 - OS X refresh plot fix
ERT-210 - Extended gen data and gen obs
ERT-210 - Python wrapping of gen data
Merge remote-tracking branch 'upstream/master' into ERT-210
ERT-211 - Wrapping of GEN_KW. Added needed python files and made the change needed to make data ready for plotting
ERT-211 - Wrapping of GEN_KW. Extended c code to return number of keywords and added unit test to verify
ERT-211 - Wrapping of GEN_KW. Changed python files to read gen kw data
ERT-519 - Plot - Histograms of GEN_KW parameters
Merge pull request #378 from iLoop2/ERT-210

Ert 210 Python wrapping of gen data
Merge pull request #381 from iLoop2/ERT-211

Ert 211
ERT-519 - Plot - Histograms of GEN_KW parameters, code  clean up in plot_data_fetcher.py
Merge pull request #382 from iLoop2/ERT-519

Ert 519 - Plot - Histograms of GEN_KW parameters
Added (empty) test for function ecl_grid_cell_contains.
Added const qualifier to function.
Added test code to run loop through all get_ijk / get_xyz combinations.
Exported tetrahedron based volume calculation.
Added test for comparison of two different volume calculations.