Updated the description for flightNumber.
Fix many typos.

primarly -> primarily
Enerygy -> Energy
automimmune -> autoimmune
theatre -> theater
fulfilment -> fulfillment
progam -> program
toystore -> toy store
pawnstore -> pawn store
existance -> existence
organiser -> organizer
organisation -> organization
spacedelimited -> space delimited
Ethopian -> Ethiopian
Add note about spelling
Improve description of 'keyword' property using Dan Scott's suggestion.

http://lists.w3.org/Archives/Public/public-vocabs/2014May/0226.html
Merge pull request #21 from vholland/master

Updated the description for flightNumber.
Added Airport > icaoCode property.
Cleaned up the description of carrier and provider. I added operator as a better property for describing organizations operating travel services.
Merge pull request #32 from vholland/master

Added Airport > icaoCode property.
Merge pull request #22 from scor/typo-fixes1

Fix many typos.
Bumped version number to 1.5, preparing next release.
Merge pull request #23 from scor/keywords-rdfs-comment

Improve description of 'keyword' property
Merge branch 'master' of https://github.com/rvguha/schemaorg
Ending sentence with '.'.
Postponing 'operator' until 1.6, to discuss Bus/Train and GovernmentService's serviceOperator.
Temporarily backing out from https://github.com/rvguha/schemaorg/commit/e14ee83fb6a3be8eab34411b52eaca066052422b
Adding valueName and urlTemplate (on an EntryPoint) based on
April 11th agreed text for Actions. This was an ommission in the RDFS but
specified in the longer document, see https://www.w3.org/wiki/WebSchemas/ActivityActions
Adding dissolvedDate, based on foundingDate text.
Discussion: https://www.w3.org/wiki/WebSchemas/dissolutionDate
removed duplicate flightnumber
basic tests
Add Periodical, PublicationIssue, PublicationVolume

Add the types and properties per
http://www.w3.org/wiki/WebSchemas/Periodicals,_Articles_and_Multi-volume_Work
along with the modifications for existing types and properties, per discussion
on public-vocabs.

Signed-off-by: Dan Scott <dan@coffeecode.net>