Xhgui Collector 1.2.0

Added

• Add profiler options
• Enable env vars for some configuration entries to make a use with docker more pleasant
• Introduce XHGUI_CONFIG_DIR constant as way to set the location of your xhgui config.php

1.1.0 - release 1 minor feature

• possibility to specify ID before saving mongo profile, see #2

1.0.0 : First release of perftools/xhgui-collector

Move repo scope `lauripiisang` -> `perftools`

 - The project moved from `lauripiisang/xhgui-data-collector` to
    `perftools/xhgui-collector`. This commit adjusts README accordingly
 - Added Lauri Piisang as author
 - TODO: add original XHGUI maintainers into authors?