Add camera compatibility for the purpose of utilize camera opening procedure

`Camera#open(int)`時、他のプロセスが使用中だと RuntimeException が飛んでくる部分の手続き的処理をまとめたユーティリティを追加
Fix to handle device admin setting and add throwable method
Fix calling method on tryOpen
Fix javadocs and license comment on exception
Merge pull request #38 from KeithYokoma/master

Add camera compat for utilizing camera opening procedure