Console.Write and Debug.Write(If)

These will create new lines anyway in JavaScript. I'm not sure if it's
better that or let an error be thrown when compiling the project to
JS...
String.Empty
A bit hacky implementation of sprintf
Improvements in time and string conversions
Some fixes in DateTime constructor and tests
Minor fixes in unit tests
Regex refactoring
Some cleaning
Minor fix in Regex unit tests
ResizeArray refactoring
More refactoring of imperative collections
Timer discarded from core library

It seems really difficult to deal with quotations related to events so
I'll stick to wrapping native browser events in the HTML extensions.
Merge pull request #113 from alfonsogarciacaro/master

Refactoring of imperative collections and more string formatting