[FIX] Remove webkitStorageInfo is deprecated warning

Chrome always prints the warning:
```
'window.webkitStorageInfo' is deprecated. Please use 'navigator.webkitTemporaryStorage' or 'navigator.webkitPersistentStorage' instead.
```

Since this is distracting, this PR makes the warning disappear.
Merge pull request #154 from systemjs/newregister

New System.register form support
Merge pull request #151 from MajorBreakfast/patch-2

[FIX] Remove webkitStorageInfo is deprecated warning
global execution scope
global execution through script injection
error handling adjustments