Add option for changing the default template symbols

[astoilkov]

The current ones are {{ and }}. The idea is to have mechanism to change those so you can't avoid collisions with other frameworks.

[gnguyo]

I have a suggestion to use

  blocks.startChar = '[';
  blocks.endChar = ']';

as options.

this will change the characters to [[ ]] or any string a user chooses.

[astoilkov]

I like how Riot does it. I suggest something like this:

blocks.brackets = '[ ]';

[gnguyo]

so the default is
blocks.brackets = '{ }';

[astoilkov]

Nope. The default should be blocks.brackets = '{{ }}';