Add query profiling and logging.

Adds both query profiling (#133) and logging of reconstructed SQL query. Current logger writes the prepared query and values separately. After this patch logger reconstructs the prepared query to actual SQL before logging it. Log entry is written as single line. This enables you to use command line tools such as grep when debugging.

This patch is based on Yoan Blancs ghh133-profiling branch. Main differences are reconstructing the query and not altering the exception handling.

https://github.com/greut/php-activerecord/compare/gh133-profiling

Example of log entry with the original logger:

2013-09-28 16:44:25 ident [info] INSERT INTO `venues`(`id`,`name`,`city`,`state`,`address`,`phone`) VALUES(?,?,?,?,?,?)
2013-09-28 16:44:25 ident [info] array (
  0 => '6',
  1 => 'The Note - West Chester',
  2 => 'West Chester',
  3 => 'PA',
  4 => '142 E. Market St.',
  5 => '0000000000',
)

Same entry with the new logger:

2013-09-29 19:46:31 ident [info] INSERT INTO `venues`(`id`,`name`,`city`,`state`,`address`,`phone`) VALUES('6','The Note - West Chester','West Chester','PA','142 E. Market St.','0000000000') -- 0.001
Tabs to spaces.
Merge remote-tracking branch 'pr/133-logging-profiling'