[FIX] add edit popup for posters

*closes ticket #1349
[FIX] Minor fixes on previous commit
[NEW] Add field dialog added to Abstracts setup
[NEW] Fossil for AbstractField
[NEW] Implemented IndicoRequest for AbstractFields
[NEW] Abstract field dialog fully functional
[FIX] ParameterManager handling integers

It now handles empty int fields and allows default value for them
[NEW] Removed unused Abstract AddField page
[NEW] Util.parameterManager.add accepts jQuery obj
[IMP] AddAbstractFieldDialog checks parameters
[MIN] Removed references to AddAbstractField page
[NEW] qTip for different types of abstract field
[IMP] ParameterManager: defaultValue for all types
[FIX] Binding changingProperty for empty values

* Non-strict equallity check prevented setting some values
* i.e. "" == 0 is true, therefore no change is set
[NEW] AbstractField subclasses

* Architecture for having several types of AbstractField
* Fossils and html adapted to new architecture
* Add field dialog created per type
[NEW] AbstractSelectionField backend
[NEW] Icomoon icons
[FIX] Webassets detection of changes in SASS files
[IMP] More SASS file organization
[IMP] AddField qtip content from template