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
DeckItem: introduce getTrimmedString()

which is like getString() but with the leading and trailing white
space removed. It is intended for names which seem to not care about
such white space in Eclipse.
Schedule: trim strings which are received from the deck

for SPE-9 only the well/group names contain spurious white space, but
I suppose that other decks also feature them in control modes, status,
etc. so it's probably a good idea to trim these as well...