Avoid crashes & A better solution for the issue #6.

[CocoaBob]

Hi,

Thanks for your project!

During my usage, I've improved some details, and I've been using my version for more than 3 months, it's very stable now.

Best regards,

[l0gg3r]

thanks @CocoaBob 👍 merging

[CocoaBob]

Thank you for accepting my pull request! Could you update the podspec please?
Although it still works with the following setting pod "LGBluetooth", :git => 'git://github.com/LGBluetooth/LGBluetooth', :branch => 'master' 😊