[Router] add getBaseURL function (without BaseURI)
[Router] rewrite getBaseHref (use getBaseURL)
fixed array_column helper
add array_plus helper function
renaming helper file from "main_functions" to "main"
[Bootstrap] changes in display_errors and error_reporting
[Memory] fixed some errors in php 5.5
[Database] improved connection, break class inheritance
add option connection_mode into database config