Fix pinning version of browserify to fix source-map issue.
Fix pinning version of browserify to fix source-map issue.

Need to pin grunt-browserify instead, as it depends on browserify > 2.33
for versions neweer than grunt-browserify 1.2.5

RickMohr/otm-core,recklessromeo/otm-core,RickMohr/otm-core,maurizi/otm-core,clever-crow-consulting/otm-core,clever-crow-consulting/otm-core,recklessromeo/otm-core,clever-crow-consulting/otm-core,maurizi/otm-core,clever-crow-consulting/otm-core,recklessromeo/otm-core,maurizi/otm-core,recklessromeo/otm-core,RickMohr/otm-core,maurizi/otm-core,RickMohr/otm-core