Added coercive calls and tests.
Merge pull request #54 from bnjbvr/coercive-calls

Added coercive calls and tests
Disable two failing tests for now.
Fix the return type of SIMD.float64x2.splat
Remove "use strict" from the polyfill

Applications may wish to use the SIMD polyfill without having
"use strict" applied to themselves.

We can use "use strict" in the benchmark though, to ensure that all the
code works under it.
Resync isTypedArray functions
Update int32x4's constructor comment
Simplify load and store polyfills
Whitespace consistency
Minor formatting tidying
Initial int16x8 and int8x16 support

https://github.com/johnmccutchan/ecmascript_simd/issues/75
fromInt16x8Bits and fromInt8x16Bits conversions
int16x8 and int8x16 constructors
int8x16 and int16x8 arithmetic
int16x8 and int8x16 load and store
Tests for float comparisons with -0.0 and NaN
Tests for int32x4 comparisons
Integer !=, >=, and <=

https://github.com/johnmccutchan/ecmascript_simd/issues/46
Unsigned integer comparisons
Saturating operators