Merge pull request #7 from aztech-digital/master

PSR4/Composer migration
Update composer.json
Merge pull request #8 from aztech-digital/master

Update composer package name & lib namespace
Update README.md
Update README.md
Update README.md
Merge pull request #1 from mdanter/master

Merge upstream changes
Merge pull request #2 from aztech-digital/master

Merge upstream changes
Merge pull request #11 from aztech-digital/CodingStandards

Coding standards
Update README.md
 - useGmp() and useBcMath() now check if the extension is loaded when the function is called.
 - fixed a few issues with the namespacing.
 - fixed some small errors that had sneaked in.
added SECcurve class, from bitcoin-lib-php (not sure where the real original is from)
fixed PHP CodeSniffer issues
use import instead of full name for ModuleConfig
added basic tests for SECcurve
added SECGcurve class that contains : secp256k1, secp256r1, secp384r1, secp521r1
removed SECcurve class that was GPL licensed.
changed code and tests to use the new SECGcurve class.
cleanup up NISTcurve. removing unsed lines and fixed import
braces on next line
changed exception type