added spinner animation while checking for update
fix ticket 2361
fixed ticket 2550 consistently with IsValid( 'integer', value )
disable System.exit
add a failsafe expression (not working yet)
solved ticket https://issues.jboss.org/browse/RAILO-2545
Merge pull request #224 from igal-getrailo/jira-2550b

Jira 2550b
Merge pull request #223 from igal-getrailo/admin-overview-002

added spinner animation while checking for update
Merge pull request #222 from igal-getrailo/jira-2361c

Jira 2361c
Merge branch '4.1' of https://github.com/getrailo/railo into 4.1