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Update how_to_install_web_env.md
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update
corect exec_command_yarn in run_pi_yarn
 changes to new lines in files, new message in ansible_create_yarn_cluster and rename var in run_pi_yarn
changes to go around ssh confirm and save time
Creates an empty cluster of VMs
skip ssh StrictHostKeyChecking and modify UserKnownHostsFile
skip ssh StrictHostKeyChecking and modify UserKnownHostsFile
Update .travis.yml
correct travis.yml
Merge branch 'master' of http://github.com/nvrionis/e-science
Update how_to_install_web_env.md