update README about ZF installation
update README: simplify dependencies
README: update email
remove construct code as it prevented the class to be used ... at all
add some getters
change setDb() signature
use alias for query result in add() method
add null as default value when parameters isn't mandatory
add  parameter where it was needed
fix query to be working on most DBMS (at least using PDO...)
remove useless semi-colon from query
do not attempt to catch exception where it shouldn't happen