Add support for JCA security providers

[smirandamedallia]

• Update the various classes to use jcajce rather than bc
• Add support to set the security provider at a library level
• Use BC and default provider

[smirandamedallia]

I have upgraded the version number since BC provider must be present in the list of providers or the Provider must be set before performing PGP operations

Security.addProvider(new BouncyCastleProvider())

[smirandamedallia]

@justinludwig Thanks for the quick response. i have addressed the changes and have updated the version to 1.2 since it is non-breaking change

[justinludwig]

Thanks! I will push out a release for this to maven central in a day or two.

[smirandamedallia]

Thanks

[justinludwig]

I pushed JPGPJ version 1.2 with this to maven central.