Added getKeyword() method to Section class.
Added new keywords for parsing cartesian grid.
Added ERT dependency in build of opm-parser.
Added class EclipseGrid with constructor for cartesian grid from deck.
Changed cornerpoint related keywords to use FLOAT.
Added float data accessors.
Added ability to create EclipseGrid from cornerpoint keywords.
New keyword PVDO
Added keywords for SPE9.
Merge pull request #160 from joakim-hove/SPE9-keywords

Added keywords for SPE9.
Merge pull request #161 from osae/kw-PVDO

New keyword PVDO
Changed unit in PVTG.
Merge pull request #162 from joakim-hove/PVTG-unit-change

Changed unit in PVTG.
Merge pull request #157 from joakim-hove/OPM-75-create-grid

Opm 75 create grid