Merge pull request #1 from Codeception/master

Update from head repo
Add --defer-flush option to prevent output buffer flushing during Codeception run
Enables use of sessions without errors due to analyse and run stages of Codeception
Add --defer-flush option to prevent output buffer flushing during Codeception run
Enables use of sessions without errors due to analyse and run stages of Codeception
Merge pull request #245 from phpcodemonkey/master

Add --defer-flush option to delay output buffer flushing