Please Review my APP

[jxu22]

This is an init version.

• I use regex to judge whether the input is legal
• Make sure the temperature value clients enter is above absolute zero
• click the empty space to hide keyboard
• Last edited item is the one to convert
• it is not the last version , I will submit a perfect version before DDL(I am currently at home so I only have xcode4 and there is some issue with the version conflict and I cannot test my code home)

Jinyao Xu

/cc @nesquena @timothy1ee

[timothy1ee]

OK, looks good, I'll save my detailed feedback for your final submission.