Fix bug with ansi escape sequence
add unitary test for ascii escape and pass the regex to a global var
rename function EsapeAnsiChar to ansiStripsSequences add some comment
Tweak so that we save the control sequence in Match.Buffer()

Using #167 as a basis, we save the original control sequence, and
only strip it when we display to peco. This also has the added
benefit that Match.Line() is used for matching, so we can effectively
match the line w/o the control sequence
remove all escape sequences

refs https://github.com/peco/peco/pull/167#issuecomment-49998149
rename
Note changes
Merge pull request #169 from peco/pr-167

Pr 167