Added missing BC check

refs https://github.com/zikula/core/issues/1863
Added simple url conflict checks, refs #1878
correct legacy event type. refs #1792 refs #2078 refs https://github.com/Portugao/MUImage/issues/112
remove use of deprecated exceptions. refs #1980
change to more appropriate exceptions. refs #1980
Merge pull request #2114 from cmfcmf/conflict-checks

Added simple url conflict checks, refs #1878
remove unneeded import.
Merge pull request #2113 from craigh/exceptions

Use better exceptions where appropriate. refs #1980
update changelog
Raised memory limit
Raised memory limit
cs fixes
Merge pull request #2118 from Guite/1.4

cs fixes
Corrected PHP requirement.
remove unneccessary ini_set() usages to change memory_limit and max_execution_time ebcause they are already set in install.php. refs #980
do not attempt to login if the system is not installed. refs #1908
completed Doctrine migration of workflows classes, minor cs fixes
Merge pull request #2120 from Guite/1.4

completed Doctrine migration of workflows classes, minor cs fixes
Fixed command registration.
Merge pull request #2121 from cmfcmf/fixed-command-regitration

Fixed command registration.