Fixes Issue 257
Update Issue 257 fixing NPE spotted in TCK start

(cherry picked from commit 47b6ea857285d091db92c68137d66eb80b3f1657)
Update Issue 257 Fixing NPE
Update Issue 257 Fixing exceptions happening on deploying directory containing META-INF/context.xml

(cherry picked from commit 8a7690918b23c510ad3ca59515171a04d29e5ea8)

Conflicts:
	containers/tomcat-7/src/main/java/org/mobicents/servlet/sip/startup/SipStandardContext.java