add teamcity build icons
Update README.md
Create .travis.yml
Update .travis.yml
merge README.md
Update README.md
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use correct FSharp.Core in proto
fix unit test to just check sign of result
Disable unit test pending fix for issue 221
Disable unit test pending fix for issue 221
fix unit test to just check sign of result
Update README.md
Update README.md
Update README.md
merge latest master
Unicode letters & operators

examples:
let ★ x = x + 5
let (|★) x y = x + y
let summ = ★ 5 |★ 5
comment about \So infix operators
apply optimizations from : https://github.com/jack-pappas/fs-core-optimized , thanks to Jack Pappas