Update README.md

add missing backtick
add bufferWithTimeOrCount
Merge branch 'master' of github.com:raimohanska/bacon.js
update relnotes
release 0.4.2
updated cdnjs link to newer version (0.4.2)
Merge pull request #182 from wolfflow/cdnjs-link-update

updated cdnjs link to newer version (0.4.2)
* Updated Grunt.js to 0.4
* Created Gruntfile.coffee
* Updated package devDependencies and their versions
updated coffee-script dependency to ~1.6.3
Merge pull request #185 from wolfflow/grunt-and-deps-update

Updated Grunt.js to 0.4
small typo fixes in README.md