#52 prepend division by zero
default value of property referrerArguments changed to empty array
debug viewhelper for requestArguments added
condition for back button changed to referrerArguments.arguments. This prevents an error caused by empty argument in link viewhelper, closes #50. Moved back button to a section - DRY
typo in condition removed
Introduction text added
Merge branch 'documentation' of github.com:dwenzel/placements into documentation