Merge pull request blinker-iot#536 from blinker-iot/dev_3.0

Dev 3.0

Merge pull request blinker-iot#527 from blinker-iot/dev_3.0

update codes, upgrade BLINKER BLE codes

Merge pull request blinker-iot#420 from blinker-iot/dev_3.0

update codes, upgrade BLINKER LOW POWER codes

Merge pull request blinker-iot#381 from blinker-iot/dev_3.0

update codes, upgrade BLINKER GPRS & NBIOT support codes

Merge pull request blinker-iot#289 from blinker-iot/dev_2.0

update readme

Merge pull request blinker-iot#281 from blinker-iot/dev_2.0

update codes, upgrade BLINKER OTA codes

Merge pull request blinker-iot#233 from blinker-iot/dev_2.0

update codes, upgrade BLINKER OTA codes

Merge pull request blinker-iot#207 from blinker-iot/dev_2.0

update codes, delete SWITCH example

Merge pull request blinker-iot#149 from blinker-iot/dev_2.0

update codes, add PUSH codes

Merge pull request blinker-iot#98 from blinker-iot/dev_2.0

update codes, add WS2812 codes & example