ci: sync jenkins script and travis config with NFD

This commit also adds support for "limited-build" job type to ndn-cxx,
and enables it for travis integrations.

Change-Id: I6960b1d683c94c433ad1bfe702c4273e01036a2c
diff --git a/.jenkins.d/README.md b/.jenkins.d/README.md
index 4720a52..db4b6c0 100644
--- a/.jenkins.d/README.md
+++ b/.jenkins.d/README.md
@@ -27,4 +27,5 @@
   Possible values:
 
   * empty: default build process
-  * `<any-string-with-extra-job-description>code-coverage` (Linux OS is assumed): build process with code coverage analysis
+  * `code-coverage` (Linux OS is assumed): build process with code coverage analysis
+  * `limited-build`: only a single build with tests