Add support for Coverity Scan of editline and add neat gfx to README

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

.travis.yml

@@ -3,4 +3,20 @@ language: c
 compiler:
   - gcc
 
-script: ./configure && make
+env:
+  global:
+   # The next declaration is the encrypted COVERITY_SCAN_TOKEN, created
+   #   via the "travis encrypt" command using the project repo's public key
+   - secure: ""
+
+addons:
+  coverity_scan:
+    project:
+      name: "troglobit/editline"
+      description: "Minix editline"
+    notification_email: troglobit@gmail.com
+    build_command_prepend: "./configure --enable-sigstop --enable-terminal-bell"
+    build_command:   "make -j5"
+    branch_pattern: master
+
+script: ./configure --enable-sigstop --enable-terminal-bell && make -j5

README.md

@@ -1,5 +1,6 @@
 editline
 ========
+[![Build Status](https://travis-ci.org/troglobit/editline.png?branch=master)](https://travis-ci.org/troglobit/editline)[![Coverity Scan Status](https://scan.coverity.com/projects/2982/badge.svg)](https://scan.coverity.com/projects/2982)
 
 This is a line editing library.  It can be linked into almost any program to
 provide command-line editing and history.  It is call-compatible with the FSF