Added keyword configuration for keywords used in SPE9 example.
Two new keywords: RVVD and TOPS
Merge pull request #154 from osae/new_keyword

Two new keywords: RVVD and TOPS
Added functionality in Completion class to adjust I and J to wellHead value if they have been defaulted (i.e. have value -1). This is unfortunate because we loose quite a lot of const correctness.
Merge pull request #153 from joakim-hove/SPE9-keywords

Spe9 fix
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
Revert "Merge pull request #157 from joakim-hove/OPM-75-create-grid"

This reverts commit 28a1c16e52e155c93d6717015b2f8d6c00ff88c4, reversing
changes made to 12cc0fec7c158a06978d45ac7422e52891b28a1c.