Update travis script

Author: caitp

tools/travis.sh

@@ -3,16 +3,14 @@
 SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 cd "$SCRIPT_DIR/.."
 
-export COVERAGE=1
-
 node_modules/.bin/jscoverage lib
 
 # TODO: Only run tests once, and use a custom reporter which outputs both LCOV and text,
 # for Travis.
 node_modules/.bin/mocha test
 STATUS=$?
 
-node_modules/.bin/mocha -R mocha-lcov-reporter test > .lcov
+COVERAGE=1 node_modules/.bin/mocha -R mocha-lcov-reporter test > .lcov
 
 cat .lcov | node_modules/.bin/coveralls