minor #49 README.md - better explanation and marketing (sstok)
minor #49 README.md - better explanation and marketing (sstok)

This PR was squashed before being merged into the master branch (closes #49).

Discussion
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Explain in a few words what RollerworksSearch is and why its "so great".

/cc @cordoval

Commits
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176235e606745e31910b86c080d18263f72fdee7 README.md - better explanation and marketing

rollerworks/RollerworksSearch,sstok/RollerworksSearch,rollerworks/search