fix(engine): Add deleted code.

related to #CAM-1448
fix(testcase): Fix test case for history level NONE

related to #CAM-1409
fix(callactivity/expression): Use #{...} as expression in calledElement

related to #CAM-1490
chore(cdi/jsf): Rename TaskForm to FoxTaskForm

related to #CAM-1609
refactor(distro): use default linux browser if configured

- use environment variable BROWSER if already set
- use gnome or X default browser if configured
- refactor browser executable search to be more extensible
- use echo -e option to enable interpretation of backslash escapes
  (most distributions disable this by default)
- remove redundant spaces
fix(start-camunda): add google chrome to browser selection
merge(start-script): add better browser handling

merges Pull Request #53

Conflicts:
	distro/gf31/assembly/src/start-camunda.sh
	distro/jbossas7/assembly/src/start-camunda.sh
	distro/tomcat/assembly/src/start-camunda.sh
docs(plugins/Data): add documentation

Related to CAM-1558
delete(engine-ws): remove deprecated WebService implementation

The incomplete and deprecated implemetation of WebServices is deleted from
the core engine.

closes CAM-1603
delete(drools): remove drools from core engine

The drools dependencies and unsupported code is removed from core engine.

closes CAM-1602
Merge branch 'master' of github.com:camunda/camunda-bpm-platform
chore(callActivity/Expression): Improve REGEX for calledElement

related to CAM-1490
chore(cdi/jsf/test): Provide test case for right bean resolving

related to CAM-1609
chore(job/retries/update): Refresh view after incrementing job retries

related to CAM-1558
fix(engine): out variables="all"

- make sure <camunda:out variables="all" /> works also in case super
  process instance has no variables

closes to #CAM-1617
Merge branch 'master' of github.com:camunda/camunda-bpm-platform
chore(maven): update maven plugin versions
chore(maven): create correct -sources.jar for glassfish ejb-service.jar

related to CAM-1573
fix(gf4): add zero argument constructor to GroupInfoDto

related to CAM-1387
chore(README): add link to EasyPick filter