Implement FileIO API

[SimonDanisch]

No description provided.

[coveralls]

Changes Unknown when pulling 2f633cc on sd/fileio into ** on master**.

[coveralls]

Changes Unknown when pulling 2f633cc on sd/fileio into ** on master**.

[coveralls]

Changes Unknown when pulling 6858b06 on sd/fileio into ** on master**.

[coveralls]

Changes Unknown when pulling 6858b06 on sd/fileio into ** on master**.

[SimonDanisch]

@aaalexandrov would be okay if I merge + tag this, whenever it's ready?

[coveralls]

Changes Unknown when pulling 03d3def on sd/fileio into ** on master**.

[coveralls]

Changes Unknown when pulling 198f5bd on sd/fileio into ** on master**.

[coveralls]

Changes Unknown when pulling 198f5bd on sd/fileio into ** on master**.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@4e11361). Click here to learn what that means.
The diff coverage is 59.25%.

@@            Coverage Diff            @@
##             master       #1   +/-   ##
=========================================
  Coverage          ?   48.48%           
=========================================
  Files             ?        3           
  Lines             ?      132           
  Branches          ?        0           
=========================================
  Hits              ?       64           
  Misses            ?       68           
  Partials          ?        0

Impacted Files	Coverage Δ
src/IL.jl	0% <ø> (ø)
src/DevIL.jl	100% <100%> (ø)
src/fileio.jl	58.49% <58.49%> (ø)

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[coveralls]

Changes Unknown when pulling 36127f5 on sd/fileio into ** on master**.

[coveralls]

Changes Unknown when pulling 476d195 on sd/fileio into ** on master**.

[coveralls]

Changes Unknown when pulling 476d195 on sd/fileio into ** on master**.