change the realize of wheel

Features

• basic picker: add click to item (f1db741)
• basic picker: change the realize of wheel (fdca711)
• basic picker new version: basic picker new version first commit (a801fce)
• BasicPicker: change to one way data (ffd94df)
• CascadePicker: add example (49c939c)
• CascadePicker: Compatible with iOS (2bd28b8)
• CascadePicker: limit the Android picker to one line (d3e2ff8)
• GLOBAL: add ios android (a42d5bd)

change the way to export and fix modal bug

Features

• picker: change the way to export and fix modal close bug (6f61b16)

remove unnecessary files

• location: remove the unneeded dependencies (e8a293e)

some changes

Bug Fixes

• location: delete unneed files (8cd4e7c)
• location: the version of istanbul (706af22)

Features

• location: add the iconStyle properties (d181481)
• location: add the unit test (ea6f368)
• location: add unit test, add note, add pushOpera function, change some exposed properties. (711d491)