finished challenge
update markdown doc
peakpado's submission  appirio-tech/lc1-project/#247
Merge branch 'master' into 247_mergetest

Conflicts:
	.gitignore
	client/edit-challenge/data/tags.json
	client/edit-challenge/js/controllers/create-challenge-controller.js
	package.json
	server/appirio_node_modules/tc-server-auth/index.js
	server/routes/challenges.js
	server/routes/localUploadMiddleware.js
Fixed tags display and file upload(test local storage only)
Merge pull request #12 from peakpado/tags_upload_fix

Fixed tags display and file upload(test local storage only)
Merge pull request #13 from appirio-tech/247_mergetest

247 mergetest