JBIDE-15760: Use newer version of facade plugin
Better factorization for signing

Rely on a skipSigning flag to avoid duplication of
signing/pack200 mojos.
Use newer TP 4.40.0.Alpha2-SNAPSHOT (includes Luna M4)
JBIDE-16309: Listing URLs of component sites

This removes the profiles "jbosstools-site", "jbosstools-nightly-staging-composite"
and "jbosstools-staging-aggregate" and removes default reference
between JBT components in parent pom.
So component poms must reference other components without
having to maintain the URL and its various parameters.

The benefit is that we avoid cycles and have better control over
inter-component dependencies.
This also provide more independence to components.
Use TP release 4.40.0.Alpha2
Use TP 4.40.0.Beta1-SNAPSHOT
Update parent pom version to 4.2.0.Beta1-SNAPSHOT
Remove backup file for pom.xml
[JBIDE-16724] add clean plugin into pluginManagement
[JBIDE-16747] Add jbosstools-sim nightly p2repository definition to parent/pom.xml
reorder jbosstools-*-site entries so that new jbosstools-sim-site is listed after base and aerogear, on which it depends, not after gwt/freemarker/birt, which are static/unchanging sites
JBIDE-16747 Max/Denis request we remove the ref to new sim site pending its creation (and naming)
set parent pom version 4.2.0.Beta2-SNAPSHOT in master
set tycho version = 0.20.0 in master branch (JBT 4.2.0.Beta2)
BIRT is now building in master and Beta1x branch, so replace jbosstools-birt-site=http://download.jboss.org/jbosstools/updates/stable/kepler/core/birt/ with jbosstools-birt-site = staging/jbosstools-birt_* site
Use new TP 4.40.0.Beta2-SNAPSHOT
JBIDE-16960 remove jbosstools-gwt-site = http://download.jboss.org/jbosstools/updates/stable/juno/core/gwt/ as no longer needed
[JBIDE-16937] add browser sim nightly update site URL property to parent/pom.xml
Merge pull request #141 from dgolovin/JBIDE-16937-master

[JBIDE-16937] add browser sim nightly update site URL property to parent/pom.xml
JBIDE-17255 Upgrade jacoco version to support JDK 1.8

The current version that we use fails to run with java 8.
The new version fixes that.