Bump version in master-branch to 5.0-alpha.1
Bump version in master-branch to 5.0-alpha.1

This is in order to make sure that the master-branch version is not
confused with the stable 4.x

mosoft521/handlebars.js,mosoft521/handlebars.js,jbboehr/handlebars.js,gautamkrishnar/handlebars.js,gautamkrishnar/handlebars.js,handlebars-lang/handlebars.js,mosoft521/handlebars.js,handlebars-lang/handlebars.js,wycats/handlebars.js,wycats/handlebars.js,handlebars-lang/handlebars.js,gautamkrishnar/handlebars.js,jbboehr/handlebars.js,handlebars-lang/handlebars.js,mosoft521/handlebars.js,mosoft521/handlebars.js,jbboehr/handlebars.js,wycats/handlebars.js,wycats/handlebars.js,handlebars-lang/handlebars.js,wycats/handlebars.js