Add explicit conversions from bytes32 to uint256 to allow binary operations #31
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In solidity 0.5.0 (see argotorg/solidity#4696) we will restrict implicit (and explicit) conversions between number literals and bytesXX types. Among others this will prevent binary operations between bytesXX and hex literals that have a different size (i.e. number of digits) - explicit casts become necessary. This PR adds the necessary explicit conversions to
strings.sol.