Added @TYPE@_vector_div() to divide all elements by scalar
ctest_run will log failed tests in addition to errors ERT-141
1. Fixed bug with optional default_value argument in constructor.
2. Implemented C based __div__()
3. Added tests for mul/div/add
4. Will raise ValueError() if incompatible sizes are combined.
Merge pull request #87 from joakim-hove/tvector-bug-141

Tvector bug 141
Updated top level README with more information about test labels
Added ecl_grid_is_instance() type check
Added file_exists test in ecl_grid_load_case()
Make sure the EclGrid() constructor will raise IOError if the load fails
Merge pull request #89 from joakim-hove/grid-load-case-bug

Grid load case bug