Coding standards update

• Automatic code style fixer added.
• Updated README file.
• Added Code of conduct & Contributing files.
• Docblocks and formatting update. Thanks @thiagotalma

Minor fix of README file

Wrong value of parameter omitScriptTag was fixed

Adding ability to omit script tag

Added extra parameter omitScriptTag to widget configuration which returning tracking script without <script> tag wrapper: @muhammadcahya

More flexibility in widget configuration

Added debugging mode #5
Added tracking object configuration #10
Add plugins support (only link enhanced attribution for now) #6

v0.1.1 update

Added anonymizeIp param

v0.1 release

Basic functionality is completed. By entering Google Tracking Id you can render whole tracking script.