Merge pull request #18 from pquerner/master

Added optional port parameter to change the default mysqli.default_port
Added advanced where options
Advanced where options
Added getOne convinience function
Added orderBy functionality
Added groupBy method
Added JOIN method
Implement getLastError to return error message
Some doc typo fixes
Input variables validation
order descending by default
update select examples
Avoid critical error after update with nonstandart bind variables
Calling reset should set values to null instead of unsetting them altogether

Gets rid of multiple PHP warning messages
Merge pull request #1 from joshfraser/patch-1

Calling reset should set values to null instead of unsetting them
Refine readme
show how to get insert id in doc
Merge pull request #37 from avbdr/master

orderBy, groupBy, Join, where, getOne, getLastError implementations -- round 2 :)