Allow spaces before array index at Type rule.

[cgewecke]

Solidity-parser currently throws an error if there are intervening spaces between a Type name and its array brackets. Ex:

uint[] x;  // <-- Fine
uint [] x; // <-- Legal but errors 

This PR

• Rewrites the Type rule to allow spaces before its array parts.
• Adds some examples of liberally spaced array declarations to doc_examples.sol

NB: The code in this PR was authored by @duaraghav8 as part of solparse. He has given permission to integrate his bug-fixes into this repo so that solidity parser efforts can be consolidated in one place.

[federicobond]

@cgewecke careful with the additional merge commit that slipped there.

[federicobond]

LGTM