dataUri as string rather than byte32. This allow longer data URI inc…

[godfreyhobbs]

…luding popular cloud based data Uris

[codecov-io]

Codecov Report

Merging #41 into master will increase coverage by 0.03%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #41      +/-   ##
==========================================
+ Coverage   96.49%   96.52%   +0.03%     
==========================================
  Files           4        4              
  Lines         114      115       +1     
  Branches       24       25       +1     
==========================================
+ Hits          110      111       +1     
  Misses          4        4

Impacted Files	Coverage Δ
contracts/LinniaPermissions.sol	95.23% <100%> (ø)	:arrow_up:
contracts/LinniaRecords.sol	98.27% <100%> (+0.03%)	:arrow_up:

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[libertylocked]

what is the URI schema?

[libertylocked]

How are the data URIs computed? How are they resolved? For instance, what makes an IPFS URI different than an HTTP URI? What are the other possible protocols? Why string not bytes? Will this break IPFS URIs? Currently the URI are IPFS paths which is exactly 32 bytes, but aren't printable ASCII. If they are stored in string, they will be stored in 2 words.

[libertylocked]

assertRevert does not catch out of gas.

[godfreyhobbs]

If the test runs out of gas they should fail. assertRevert ensures this failure. expectThrow is too broad.

[godfreyhobbs]

Fixes #40