Omit version from install instructions

Composer now installs the latest stable version available when omitted from command
Test case for dechex conversion & fix
Merge pull request #26 from aztech-digital/composer-instructions

Composer instructions
Fix hexDec tests

Tests were failing because of strict type checking (string vs int)
Remove empty test
Merge pull request #27 from aztech-digital/dechex

Test case for dechex conversion & fix
Rename MathAdapter