New Release v0.3.7: Fix bug #25

Fix critical bug #20, which affects the listen block rendering.

Fix incorrect attribute accessing if class Option.

1. Fix critical issue #12. 2. Optionmize some codes. This version has…

… some APIs backword incompatible, which are figured out in readme file.

Add the support of setting haproxy config file content as the second …

…param for initializing parse.Parser instance.

fix bind-process error parsing, then change version to 0.2.2

fix #5, then change version to 0.2.1

bug fix: typo error and server-attributes whitespaces error