Now all branches will be tested by Travis.

This enables testing on developer repositories.
Removed email notification.
Merge pull request #464 from endJunction/SetMinimumGCCVersion481

Require minimum gcc version to be 4.8.1.
Merge pull request #469 from bilke/travis-all-branches

Now all branches will be tested by Travis.
When giving a custom comparison in std::sort use < as operator (not <=).

This fixes crashes in debug mode (especially in some tests) in which case the
runtime checks this rule and quits execution on violation.
Updated gtest to 1.7
Added gtest license.
Reintroduced scripts/packaging/.DS_Store which is needed for mac packaging.
Fixed logo path for mac packaging.
Fixed wrong support point index at start and end point.
Merge pull request #471 from bilke/sort-crash

When giving a custom comparison in std::sort use < as operator (not <=).
Merge pull request #472 from bilke/ctest-1.7

Update gtest to 1.7
Merge pull request #463 from endJunction/SkeletonProjectData

Skeleton project data
Merge pull request #473 from bilke/fix-interpolation

Fixed wrong support point index at start and end point.
[PL] Correct GroundwaterFlowProcess.h filename.

Now matching the class name.
[PL] Add mesh subset to initialize().
[PL] Initialize MeshSubsets and MeshComponentMap.
[PL] Rename mesh_items_all_nodes; items->subset.
[PL] Add destructor for GroundwaterFlowProcess.
[PL] Move mesh_component_map to class variables.

...from the initialize().
Also delete it in the dtor.