Update grunt-ts to 1.7

1.7 brought increased performance (compile time) on windows boxes + decreased cpu utilization due to async control of `tsc` thanks to @bartvds https://github.com/grunt-ts/grunt-ts/pull/64
Merge pull request #93 from basarat/patch-1

Update grunt-ts to 1.7
Merge pull request #92 from am11/master

Config: Search in Home directory
Fix misspelling
Remove console.log from test
Improve unreachable rule for unbraced conditionals (#83 and #31)

There should no longer be false positives for if and else statements
without braces that end in return (and similar statments) for the
no-unreachable rule.
Merge pull request #97 from gscshoyru/improve-unreachable-rule

Improve unreachable rule for unbraced conditionals (#83 and #31)
Update changelog and bump version number to 0.4.6
Fix for #99 -- export import no longer a false positive for unused rule

Also cleaned up/fixed the no unused variable rule and tests a bit.
Merge pull request #103 from gscshoyru/import-export-unused-fix

Fix for #99 -- export import no longer a false positive for unused rule
Fixes #96 -- whitespace checking is now enforced on the => token
Fix test
Refactor and cleanup
Merge pull request #104 from gscshoyru/whitespace-check-equals-greater-than-token

Whitespace check equals greater than token
Fixes #37 -- don't ignore leading and trailing underscores and dashes
Add test
Merge pull request #105 from gscshoyru/better-rulename-parsing

Fixes #37 -- don't ignore leading and trailing underscores and dashes
Fixes #100 -- unreachable rule no longer triggers for function declarations
Merge pull request #106 from gscshoyru/hoisted-functions-unreachable

Fixes #100 -- unreachable rule no longer triggers for function declarations
Fixes #94 -- EOF is now good enough whitespace for whitespace rule