Renamed example executables

[gpakosz]

I renamed example executables:

    example/Example.cpp          --> example/ParallelSum.cpp
    example/ExampleBenchmark.cpp --> example/ParallelSumBenchmark.cpp
    example/Example_c.c          --> example/ParallelSum_c.c

This prevents CMake from failing building them on case-insensitive filesystems.

[dougbinks]

Thanks! Merged this with some changes to all branches. I'm surprised you had problems with case insensitive filesystems, I've checked the project out on Win/Mac/Linux with no problems - however this naming is much better.

[gpakosz]

Thanks!

I have a case-insensitive filesystem on my Mac specifically to catch those kind of problems in our codebase :)

CMake bailed out right away.

[dougbinks]

Ah - I see, you're building into the root folder.

I wouldn't do that in general - I .gitignore the folder build so you can build from there. I'll add a note in readme.