add release taskes to rakefile
bump version
do not raise if piwik_id is a number
Merge pull request #5 from MrZYX/number_as_piwik_id

accept integer value for 'piwik_id'
renamed falsely as 'async' designated synchronous JS template to 'sync'
added truly asynchronous JS template named 'async'
set asynchronous JS template as default and pushed version to 0.2.0