Update options.html

removed useless numbers in "detectedApiKey" span
updated minor version to 0.3.1
Added Github Link

Added Github Link in the options after Official Thread link
use by default Autodetect API + cleanup

When the user press the JSIT button, no API key is set and the user is
logged on JSIT (and an API key is generated), a message will ask the
user if he wants to use the key autodetected. + removed some useless
portions of code related to the former button option.
Revert "use by default Autodetect API + cleanup"

This reverts commit 1f9efb7e69c92bd46232f7c32069b8ce363c15a9.
suggest Autodetected key in the alert + cleanup

When the user press the JSIT button, no API key is set but an API key is
detected, a message will ask the user if he wants to use the key
autodetected. + removed some useless portions of code related to the
former button option.
Merge pull request #1 from MrPointVirgule/master

0.3 => 0.3.1