MapSplitter should ignore key-value separator after first

[cgdecker]

Discussion here: https://groups.google.com/d/topic/guava-discuss/FuyKu3oF_PQ/discussion

Basically, after encountering the first key-value separator, it may be reasonable to just include any other separators that appear before the next entry separator in the value rather than throwing IllegalArgumentException as we do now.

Example:

MapSplitter splitter = Splitter.on(";").withKeyValueSeparator("=");

splitter.split("key=value;key2=value"); // normal
splitter.split("key=value;key2=value="); // currently throws IAE
// proposed change would make the second entry split to "key2" -> "value=" instead

[MohandAndel]

Hello @cgdecker , I did fixed this issue but with a little duplicate codes :) , because I tried to avoid adding new methods .

and because I am new in github , I don't know if I should create new pull request or referenced this issue from the commit is enough .

Thank you :)

[magicbane]

A workaround fro this particular issue is to use withKeyValueSeparator(Splitter.on("=").limit(2)).