change the way of store a location of an asset
add Exclusion Feature for scopes and assets

- a list of scopes/parent (separated by comma) can be exclude by the property 'excludesScopes' into 'dandelion/dandelion.properties'
- a list of assets (separated by comma) can be exclude by the property 'excludesAssets' into 'dandelion/dandelion.properties'
add 'servlet-api' dependency to Dandelion jsp