Import beginnings of a CSS parsing library.

Currently comprises a lexer.

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+LibCSS testcases
+===============
+
+Testcases for LibCSS are self-contained binaries which test various parts
+of the CSS library. These may make use of external data files to drive
+the testing.
+
+Testcase command lines
+----------------------
+
+Testcase command lines are in a unified format, thus:
+
+ 	<aliases_file> [ <data_file> ]
+
+The aliases file parameter will always be specified (as it is required for
+the library to work at all).
+
+The data file parameter is optional and may be provided on a test-by-test
+basis.
+
+Testcase output
+---------------
+
+Testcases may output anything at all to stdout. The final line of the 
+output must begin with either PASS or FAIL (case sensitive), indicating 
+the success status of the test.
+
+Test Index
+----------
+
+In the test sources directory, is a file, named INDEX, which provides an 
+index of all available test binaries. Any new test applications should be
+added to this index as they are created.
+
+The test index file format is as follows:
+
+	file         = *line
+
+	line         = ( entry / comment / blank ) LF
+
+	entry        = testname 1*HTAB description [ 1*HTAB datadir ]
+	comment      = "#" *non-newline
+	blank        = 0<OCTET>
+
+	testname     = 1*non-reserved
+	description  = 1*non-reserved
+	datadir      = 1*non-reserved
+
+	non-newline  = VCHAR / WSP
+	non-reserved = VCHAR / SP
+
+Each entry contains a mandatory binary name and description followed by 
+an optional data directory specifier. The data directory specifier is 
+used to state the name of the directory containing data files for the 
+test name. This directory will be searched for within the "data" 
+directory in the source tree. 
+
+If a data directory is specified, the test binary will be invoked for
+each data file listed within the data directory INDEX, passing the 
+filename as the second parameter (<data_file>, above).
+
+Data Index
+----------
+
+Each test data directory contains a file, named INDEX, which provides an 
+index of all available test data files.
+
+The data index file format is as follows:
+
+	file         = *line
+
+	line         = ( entry / comment / blank ) LF
+
+	entry        = dataname 1*HTAB description
+	comment      = "#" *non-newline
+	blank        = 0<OCTET>
+
+	dataname     = 1*non-reserved
+	description  = 1*non-reserved
+
+	non-newline  = VCHAR / WSP
+	non-reserved = VCHAR / SP
+
+Each entry contains a mandatory data file name and description.