pom.xml(maven-{surefire,failsafe}-plugin: updated to 2.13

@see http://www.mail-archive.com/announce@maven.apache.org/msg00477.html (2.12.1, 2.12.2)
@see http://www.mail-archive.com/announce@maven.apache.org/msg00483.html (2.12.3)
@see http://www.mail-archive.com/announce@maven.apache.org/msg00521.html (2.13)

No functional changes.
pom.xml(maven-compiler-plugin): updated to 3.0

@see http://www.mail-archive.com/announce@maven.apache.org/msg00465.html (2.5)
@see http://www.mail-archive.com/users@maven.apache.org/msg125302.html (2.5.1)
@see http://www.mail-archive.com/announce@maven.apache.org/msg00512.html (3.0)

No functional changes.
pom.xml(maven-resources-plugin): updated to 2.6

@see http://www.mail-archive.com/announce@maven.apache.org/msg00481.html

No functional changes.
pom.xml(maven-enforcer-plugin): updated to 1.2

@see http://www.mail-archive.com/users@maven.apache.org/msg127789.html

No functional changes.
pom.xml(maven-war-plugin): updated to 2.3

@see http://www.mail-archive.com/announce@maven.apache.org/msg00497.html

No functional changes.
pom.xml(maven-javadoc-plugin): updated to 2.9

@see http://www.mail-archive.com/announce@maven.apache.org/msg00493.html

No functional changes.
pom.xml(cobertura-maven-plugin): updated to 2.5.2

@see http://www.mail-archive.com/users@maven.apache.org/msg126706.html

No functional changes.
pom.xml(jetty-maven-plugin): updated Jetty to 8.1.8.v20121106

@see http://dev.eclipse.org/mhonarc/lists/jetty-announce/msg00032.html (8.1.6.v20120903)
@see http://dev.eclipse.org/mhonarc/lists/jetty-announce/msg00035.html (8.1.8.v20121106)

No functional changes.