Feat 154 unique env name

[fanhousanbu]

Which changes (Bug/Feature):

Fixes #154

Special notes for reviewers:

compile env name is unique when add / modify（case insensitive); 
history data can't be save while saving on edit page

[codecov-commenter]

Codecov Report

Merging #163 (81742ea) into master (f3c5ecc) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #163   +/-   ##
=======================================
  Coverage   41.71%   41.71%           
=======================================
  Files           4        4           
  Lines         163      163           
=======================================
  Hits           68       68           
  Misses         93       93           
  Partials        2        2           

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[sampsonye]

/LGTM

[colynn]

/lgtm