disable tests correctly
add signed FSharp.Core binaries for profiles 78 and 259
update nuget package specs
Use MONO_VERSION throughout .travis.yml
Merge pull request #330 from rneatherway/patch-1

Use MONO_VERSION throughout .travis.yml
Unicode letters & operators

examples:
let ★ x = x + 5
let (|★) x y = x + y
let summ = ★ 5 |★ 5
comment about \So infix operators
.sharingan.yml