docs(features/session.jmd): typo

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docs(endpoint_handlers/traditional.jmd): typo fixes #1153
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Merge branch 'develop'
chore($package.json): Explicitly declare karma version
docs(contributing.jmd): Updated build instructions
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docs(contributing.jmd): Updated build instructions
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Merge branch 'master' into develop

Conflicts:
	package.json
Merge branch 'develop' into feature/concurrent-chunk-uploads
docs(contributing.jmd): update contributing doc
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Merge branch 'master' into develop
docs(contributing.jmd): fix typos
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Merge branch 'master' into develop
Merge branch 'develop' into feature/concurrent-chunk-uploads
docs($total-progress): document template elements #384
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Merge branch 'master' into develop
Merge branch 'develop' into feature/concurrent-chunk-uploads
fix($ie-filesize): file size incorrectly reported for older browsers #1161