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.
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