Styling options

[AarynSmith]

Fixes issue where long languages would push the line too long (Javascript was one character too long)
Now, automatically sizes the line based on language length, and time length, and can automatically size bar to fit.

Adds additional styling options for the progress bar set through environment variables:

• GIST_BARSTYLE: "SOLIDLT" (default) "SOLIDMD" "SOLIDDK" "UNDERSCORE" and "EMPTY"
• GIST_BARLENGTH: 21 (default for backward compatibility), hard set to a specific length or set to -1 to automatically size
• GIST_TIMESTYLE: "LONG" (default) will use the standard time string from wakatime, "SHORT" will abbreviate it to "#h#m" (or just "#s" for "0 secs")

[YouEclipse]

Thanks for the PR, it is really awesome . i will make a update of the README_zh also.

[AarynSmith]

Glad you like it. I'd update the README_zh, but I believe you might be better qualified to handle that than I am. 😁