Test Crypto library compatibility with eXist 5

[joewiz]

Please check eXist-db/expath-crypto-module#11 to make sure:

• crypto library is compatible with eXist 5
• confirm if it's only compatible with >= eXist 5, or if it's also backward compatible with 4.x
• if only compatible with eXist 5, increment the crypto library to a new major version for the package to indicate the breaking change
• and indicate the dependency on eXIst 5 in expath-pkg.xml

(As discussed on today's Community Call.)

[adamretter]

Closed by eXist-db/expath-crypto-module#17