ignore cached db if not readable

[KlausC]

Fixes #40. Also add Project.toml.

[KlausC]

Failing tests because of missing network connectivity on Linux nodes of travis.

[andreasnoack]

Could you please rebase this one?

[codecov[bot]]

Codecov Report

Merging #42 into master will decrease coverage by 0.19%. The diff coverage is n/a.

@@            Coverage Diff            @@
##           master      #42     +/-   ##
=========================================
- Coverage   90.93%   90.74%   -0.2%     
=========================================
  Files          12       12             
  Lines        1876     1945     +69     
=========================================
+ Hits         1706     1765     +59     
- Misses        170      180     +10

Impacted Files	Coverage Δ
src/types.jl	62.28% <0%> (-7.9%)	:arrow_down:
src/MatrixDepot.jl	95.45% <0%> (-4.55%)	:arrow_down:
src/matrixmarket.jl	91.4% <0%> (-1.53%)	:arrow_down:
src/download.jl	92.07% <0%> (-0.89%)	:arrow_down:
src/common.jl	96.81% <0%> (+0.02%)	:arrow_up:
src/datareader.jl	88.31% <0%> (+0.15%)	:arrow_up:
src/higham.jl	94.63% <0%> (+0.16%)	:arrow_up:
src/regu.jl	92.23% <0%> (+0.36%)	:arrow_up:
src/markdown.jl	98.7% <0%> (+1.51%)	:arrow_up:
src/logical.jl	71.28% <0%> (+7%)	:arrow_up:

---

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[KlausC]

This is a bug fix, could it be merged?

[andreasnoack]

I think it would be fair with a little more explanation of a ~40k lines diff. E.g. is the role of data/uf_matrices.html and why is MAT.jl added as dependency?

[KlausC]

Sorry, the last 2 commits should not go there. They belong to the current WIP-PR and will be explained. For the moment, please ignore this until I have undone the unwanted commits.

[KlausC]

This PR is retired - I could not mange to revert the necessary commits. Added bug fix will be included in upcoming PR.