Fixed flaw in :key_value rule

I edited the rule(:key_value) so spaces are not required before and after the =.
This way, "key=3" would pass.
Ignores spaces

I modified the Parslet rules to make everything ignore spaces. This way, `myArray=[1,2,3,4,5]` passes.
Merge pull request #1 from 88Alex/patch-1

Spaces now ignored