Introduce JSON validation

Support basic validation for JSON files according to the
draft http://tools.ietf.org/html/draft-zyp-json-schema-03.

This is not a complete implementation yet, but it should
already be useful, since "type" verification along with
many of the attributes is done.

Change-Id: I364bc98dd92937c5e2ea9cba7e15ed8e03eb9beb
Reviewed-by: Erik Verbruggen <erik.verbruggen@nokia.com>

src/libs/qmljs/qmljs-lib.pri

@@ -32,7 +32,8 @@ HEADERS += \
     $$PWD/qmljscontext.h \
     $$PWD/qmljsscopechain.h \
     $$PWD/qmljsutils.h \
-    $$PWD/qmljsstaticanalysismessage.h
+    $$PWD/qmljsstaticanalysismessage.h \
+    $$PWD/jsoncheck.h
 
 SOURCES += \
     $$PWD/qmljsbind.cpp \
@@ -56,7 +57,8 @@ SOURCES += \
     $$PWD/qmljscontext.cpp \
     $$PWD/qmljsscopechain.cpp \
     $$PWD/qmljsutils.cpp \
-    $$PWD/qmljsstaticanalysismessage.cpp
+    $$PWD/qmljsstaticanalysismessage.cpp \
+    $$PWD/jsoncheck.cpp
 
 RESOURCES += \
     $$PWD/qmljs.qrc