ci: Enable automatic dependency installation in Jenkins scripts

This commit also unifies TravisCI dependency installation using Jenkins
scripts.

Change-Id: Ia7bae2e2f31e781c07acea729d61fa07345760ab
Refs: #2843
diff --git a/.jenkins.d/README.md b/.jenkins.d/README.md
new file mode 100644
index 0000000..956ae18
--- /dev/null
+++ b/.jenkins.d/README.md
@@ -0,0 +1,30 @@
+CONTINUOUS INTEGRATION SCRIPTS
+==============================
+
+Environment Variables Used in Build Scripts
+-------------------------------------------
+
+- `NODE_LABELS`: the variable defines a list of OS properties.  The set values are used by the
+  build scripts to select proper behavior for different OS.
+
+  The list should include at least `[OS_TYPE]`, `[DISTRO_TYPE]`, and `[DISTRO_VERSION]`.
+
+  Possible values for Linux OS:
+
+  * `[OS_TYPE]`: `Linux`
+  * `[DISTRO_TYPE]`: `Ubuntu`
+  * `[DISTRO_VERSION]`: `Ubuntu-12.04`, `Ubuntu-14.04`, `Ubuntu-15.04`
+
+  Possible values of OSX OS:
+
+  * `[OS_TYPE]`: `OSX`
+  * `[DISTRO_TYPE]`: `OSX` (can be absent)
+  * `[DISTRO_VERSION]`: `OSX-10.10`, `OSX-10.9`, `OSX-10.8`, `OSX-10.7`
+
+- `JOB_NAME`: optional variable to define type of the job.  Depending on the defined job type,
+  the build scripts can perform different tasks.
+
+  Possible values:
+
+  * empty: default build process
+  * `code-coverage` (Linux OS is assumed): build process with code coverage analysis