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Update googletest and benchmark libraries, remove gcov link dependency

Linq creators

in order to build with cygwin, maybe because of new benchmark version

in order to build with cygwin, '-std=c++11' flag does not allow cygwin/mingw
compiler to use gnu (non-standard) functions, '-std=gnu++11' does

improving the performance of "take": it won't any longer iterate through...

improving the performance of "take": it won't any longer iterate through the whole sequence, only the items it needs to

Linq Creators Improvement

1) Changed the template of 'from(const TV<TT,TL> & container)' function from int to unsigned. Only this way it accepts std::array properly for me.

2) Changed return types of some 'from()' functions to auto and used decltype() to generate the type of iterator, because there is no guarantee that iterator of collection A is A::const_iterator.

3) Added two more versions of 'from()' function, which accept std::set and std::map.

Plus: Untabyfied

Project structure was reorganized.

Project structure was reorganized. Benchmarks and unit tests were separated. For benchmarks was set Release build mode. Raw Makefiles were removed. Source code of Google test framework (v. 1.7) was added in the repository. Broken changes: Visual Studio project files don't match with new project structure.

Basic CMake support.

Speed tests were rewritten as benchmarks (instead of unit tests).

Speed tests were rewritten as benchmarks (instead of unit tests). Submodule google benchmark was added.

Remove Google Mock redundant dependency.

Fix compile tests on linux gcc 4.8.1.

Fix compile tests on linux gcc 4.8.1. Add include guard (pragma once) in boolinq.h, add Makefile, add explicit include of <climits>, comment code which use std::vector of const int, clarify typenames inside utility templates.