Update README.md

Temporarily remove Travis badge; there appears to be a problem with luajit 2.0.0-beta9, and I should figure out how to get it to use the latest luajit instead.
core whitespace cleanup
Don't boild down stacktrace if origin is not current testfile.

Fixes #202.
Merge pull request #203 from lipp/fix-stacktrace-filter

Don't boild down stacktrace if origin is not current testfile.
Update README.md
Make tests to look a bit better

This allows us to transform

describe("CONTEXT", function()
  it("DOES SOMETHING", function()
    -- do something
  end)
end)

into

describe "CONTEXT" (function()
  it "DOES SOMETHING" (function()
    -- do something
  end)
end)

which is easier to read (and write too, no comma :) )

Uses that Lua syntactic sugar:
  function("STR")  is equal to function "STR"
and a little bit of functional programming (anonymous funcs + closures)
Merge pull request #209 from Pencioner/master

Make tests to look a bit better
fixed bug where if failures in tests happen in a very specific order then last_j will be nil, causing table.concat to throw an error.
add support for the `context` describe alias
Merge pull request #211 from Olivine-Labs/bugfix_lastj

fixed bug where if failures in tests happen in a very specific order the...
assign _TEST for `strict.lua`
Merge pull request #213 from Olivine-Labs/context

add support for the `context` describe alias
Merge pull request #214 from Olivine-Labs/strict-mode

assign _TEST for `strict.lua`
Fix an issue when busted is called with -o

* This change makes sure opath is not nil

* When trying busted -o some/output.lua, busted was failing with:

Busted process errors occured / Unable to open output module; requested option '--output=some/output.lua'.
$HOME/.luarocks/share/lua/5.1/busted/core.lua:67: $HOME/.luarocks/share/lua/5.1/pl/path.lua:233: argument 1 expected a 'string', got a 'nil'
Added multiplatform CI testing
Use scm version of lua-ev
Adapted command-line spec to the pl issue
Merge pull request #219 from mpeterv/multiplatform_testing

Multiplatform testing
Merge pull request #216 from losinggeneration/master

Fix an issue when busted is called with -o my/output.lua
use `string.len` instead of `#` on async trace test