Extend delimiters for tag values

[xiam]

I think tab could work to delimit, but that is pretty much it, as some people might want space or other characters in their value, prob not tab or newline tho

@pkieltyka accepting spaces and handling cases like:

+ tag = this a tag value with # spaces # and hash# sign # and this is a comment

would be problematic from the parser's point of view (because identifying a comment would depend on the context and we'll have to ask things like is this the last # preceded by [whitespace] on this line?)

What we can do to solve this problem is to look for [whitespace] or [newline] to mark the end of a token, and also add support for quoted values that may include [whitespace]. See below:

+ json = field_2 # a comment
+ go.tag.db = field_2 # a comment
+ go.tag.db.1 = default**:**now**()**,use_zero#000 # # # a comment with two hashes
+ go.tag.db.2 = default**:**now**()**,use_zero,"// # a comment
+ go.tag.db.3 = "default**:**now**()**,use_zero,// # this is not a comment" # this is a comment
+ go.tag.db.4 = default**:**now**()**,use_zero

What do you think?

Closes #60

[xiam]

Rebased and passing tests.