Changed yaml parsing to preserve types in notebook. Made multiple yaml inputs valid.

[MSeal]

Yaml inputs had to be composed before calling papermill when there didn't seem to be a strict reason to limit inputs. This change makes it so you can mix and match the command inputs to fit your incoming parameter data. In my case I had multiple json objects as well as individual parameters being collected that needed separate assignments in the notebook. Now later yamls will override earlier ones with individual parameters taking highest preference.

Furthermore, passing a json object will give you a dict in your notebook instead of a string. This makes passing complex parameters very nice for consumption in the notebook.

Also added specs for R parameter decoding (and validated they worked even though there aren't R kernel automated specs yet in the repo).

[MSeal]

The R calls corresponding to the R decode specs:

#R version 3.3.2 

library("rjson")

t0 = "foo"
t1 = "{\"foo\": \"bar\"}"
t2 <- fromJSON(t1)

print(t0)
print(t1)
print(t2)

t3 = list("foo" = "bar")
t4 = list("foo" = "\"bar\"")

print(t3)
print(t4)

t5 = list("foo" = list("bar"))
t6 = list("foo" = list("bar" = "baz"))
t7 = list("foo" = list("bar" = "\"baz\""))

print(t5)
print(t6)
print(t7)

t8 = list("foo")
t9 = list("foo", "\"bar\"")

print(t8)
print(t9)

t10 = list(list("foo" = "bar"))
t11 = list(list("foo" = "\"bar\""))

print(t10)
print(t11)

t12 = 12345
t13 = -54321

print(t12)
print(t13)

t14 = TRUE
t15 = FALSE

print(t14)
print(t15)

with outputs:

[1] "foo"
[1] "{\"foo\": \"bar\"}"
$foo
[1] "bar"

$foo
[1] "bar"

$foo
[1] "\"bar\""

$foo
$foo[[1]]
[1] "bar"


$foo
$foo$bar
[1] "baz"


$foo
$foo$bar
[1] "\"baz\""


[[1]]
[1] "foo"

[[1]]
[1] "foo"

[[2]]
[1] "\"bar\""

[[1]]
[[1]]$foo
[1] "bar"


[[1]]
[[1]]$foo
[1] "\"bar\""


[1] 12345
[1] -54321
[1] TRUE
[1] FALSE

[willingc]

@MSeal cool! Can you split this PR into two: one for CLI/multiple and one for R stuff? Will be easier to test, review, and merge. Thanks.

[MSeal]

Sure I'll pull the R specs into another PR tonight

[codecov]

Codecov Report

Merging #88 into master will increase coverage by 2.82%.
The diff coverage is 93.18%.

@@            Coverage Diff             @@
##           master      #88      +/-   ##
==========================================
+ Coverage   55.46%   58.28%   +2.82%     
==========================================
  Files           8        8              
  Lines         869      887      +18     
==========================================
+ Hits          482      517      +35     
+ Misses        387      370      -17

[MSeal]

Closing this PR for the 3 broken down versions.