Throw an exception if size-in-bytes values are out of Long range

Fixes #170
Improve size-in-bytes parser's use of BigInteger/BigDecimal

 - use bitLength to see if we overflow Long
 - use BigInteger and BigDecimal to parse, instead of parseLong/parseDouble
Added missing duration unit short names that are supported in scala.concurrent.duration.DurationConversions.
Added more duration unit short names for hour, minute and second.
Revert "Added more duration unit short names for hour, minute and second."

This reverts commit ebb526304ecebb561ba5c5f4ff4ce369b303e6e0.
Patch spec with duration units from Scala that were previously missing.
Added sbt library dependencies to README.md

 - Lots of people use sbt, why keep a maven sample and forget about sbt?
   :)
Avoid awkward do-while in Tokenizer.pullQuotedString

Not a big deal, but I think this reads more clearly now.
Merge pull request #210 from chris-martin/pull-quoted-string-do-while

Avoid awkward do-while in Tokenizer.pullQuotedString
Missing backtick in HOCON.md

Reported by @takc923
Upgrade to SBT 0.13.7
Merge pull request #215 from benmccann/minor-upgrades

Upgrade to SBT 0.13.6
updated README.md to add link to python port (pyhocon)
Merge pull request #216 from chimpler/master

Updated README.md to add link to python port (pyhocon)
Document ConfigFactory.parseFile
Fix 'allow unresolved' for at least two list cases

lists did not respond well to cases where only some of their
elements were resolved or even when none of them were resolved
but one of their object identities happened to change. Previously
this would throw a nasty 'bug or broken' exception so it seems
unlikely to have unintended side effects.
isolate test for allowing unresolved list elements
Fix warning about use of octal escape in string literal
Change expected result of delayedMergeObjectResolveProblem5

Our "do not look at what we're resolving in order to resolve it"
algorithm is now more robust so we get a different answer.
Merge branch 'master' of https://github.com/Kornel/config into Kornel-master

Conflicts:
	README.md