Add tests for various corner cases

fix make_persistent_atomic

string: add assign methods

fix rethrowing constructor exception

tests: change function name to match behaviour

add vector range() and crange() methods

Run tests on tmpfs on travis

fix string's methods description

Improve code coverage for locking APIs and transactions.

test: add gnome-terminal support

string: add compare functions

Limit test execution time on AppVeyor.

test: rm vector_private test

vector: add comparison operators between pmem::vector and std::vector

add .gitattributes

Merge back changes from stable-1.5

extend vector API

set text and eol config parameteres

explicitly cast values to match parameters

travis: run valgrind tests only in one configuration.