add dense vector implementation
add a test checking dense vector interface
- rm _vector_type, operator[]
- rename getNRows() to size()
getNRows() was renamed to size()
changed to use inheritance here
Make use of Travis retry-feature.

See http://about.travis-ci.org/blog/2013-05-20-network-timeouts-build-retries/
define explicitly a copy assignment operator= which takes a scalar value for initializing all entries
- add operator<<  for Vector
- change an argument of Vector::write() from ostream to string (i.e. filename)
unsigned is replaced with std::size_t in Vector
fixed issue with string conversion for shapefile-names
Merge branch 'master' of https://github.com/ufz/ogs
replace spaces with tab for consistency
Added private method PointVec::correctNameIDMapping().

PointVec::correctNameIDMapping() changes the _name_id_map after modifying the point set.
Merging the names of geometries together with geometric objects.
Adding tests for GEOObjects::mergeGeometries().
Restricted linking to the needed boost lib only.
Changing file name Matrix.h -> DenseMatrix.h.
Changed class name from Matrix to DenseMatrix.
Adding const keyword for return type fixes programming error.
Merge pull request #139 from TomFischer/MathLibChanges

Renamed class Matrix to DenseMatrix.