Add Travis CI config to run syntax tests

[JavaScript] `yield` and `await` expressions

[JavaScript] Implemented `for await`.

Since recently (http://forum.dlang.org/post/esjclvbebspqkekjmwki@forum.dlang.org) the `do` keyword can be used in place of the `body` keyword in function declarations with contracts.

…t was invalid for no good reason.

Fixed syntax errors in the test file and added a test for using `do` instead of `body` in a function definition with contracts.

Fixes issue #1328

- Highlight triple quoted strings
- Highlight "dollar slashy strings"
- Highlight unclosed strings
- Highlight erroneous newlines in single line strings
- Highlight invalid identifiers in interpolated strings
- Highlight interpolation in slashy strings ("regexp")
- Enable full language highlighting inside interpolation
- Only include the proper unicode ranges in identifiers (variables)
  inside string interpolation.
- Only match valid escape sequences (instead of any character at all);
  note that the different kinds of strings don't share all of the same
  escape sequences.
- Add a whole bunch of tests for strings

Note: Technically "slashy strings" (scoped as "regexp" here) allow
newlines as well, but I think more work needs to be done before
removing the lookahead expression on the opening '/'.

For instance, the following is already highlighted incorrectly and it
would probably lead to even more troubles if these were set free from
their current single line containment (without additional work).

```groovy
// Current (incorrect) highlighting
def a = 1 / 2 + / 3 /
//      ^ constant.numeric.groovy
//        ^^^^^^^ string.regexp.groovy
//                ^ constant.numeric.groovy
//                  ^ keyword.operator.arithmetic.groovy

// Correct highlighting
def a = 1 / 2 + / 3 /
//      ^ constant.numeric.groovy
//        ^ keyword.operator.arithmetic.groovy
//          ^ constant.numeric.groovy
//            ^ keyword.operator.arithmetic.groovy
//              ^^^^^ string.regexp.groovy
```

 - Names with packages are correctly recognized
 - Constants' definitions can contain several constants
 - Fixed generic/array related false positive invalids
 - All braces are now 'punctuation.section'
 - Removed void/threadsafe

…scope. (#1342)

Upate D.sublime-syntax for new function contracts.

…ssion

[JavaScript] Arbitrary expressions in `extend`.

[Java] Refactor javadoc

[Matlab] Fix highlight of functions with no return or argument

[JavaScript] Added spread operator and made computed property names consistent.

…vascript-better-arrow-fallthrough

* Properly implemented variable bindings.
* Add tests.
* Cleaned up various naming logic.
* Simplified constructor contexts. behavior should be slightly better when a complex expression follows `new`.
* Move bindings tests to tests directory.

[CSS] allow url function to be used in at-namespace

[Markdown] support strikethrough

…s_tweak

[C#] tweak to code block handling outside of a class

…avascript-better-arrow-fallthrough

[Rust] fix nested array template arguments

[Java] Fully Qualified Name

…ghting

[Groovy] Improve string syntax highlighting

…adoc (D, Groovy)

…rough

[JavaScript] Exported variable declarations end properly.

…racket-handling

[JavaScript] Improved handling of unexpected close punctuation.