Implementation of deleteat!
Refactor splice!, delete!
Bug fixing only
Added SharedArray
implement a simple code coverage tool

To use the tool, pass --code-coverage. On exit, for each source file foo.jl for
which we have data, write foo.jl.cov next to the original file, with execution
counts in front of each line, or "-" if no data.

also start consolidating compiler options into a jl_compileropts struct
fix redundant first line count

switch line counters to internal linkage
extend LOAD_PATH via environment variable
change ordering of LOAD_PATH
improved JULIA_LOAD_PATH code based on Stefans suggestions
Add some documentation
Shorten code further
Travis tests with release and nightly
Windows: update download links
Incorrect link in 64e69bc
spzeros now requires both, rows and columns.

Fix #5436
when no delimiter is specified, delimiters are taken as one or more adjoining whitespaces.
fixed bug in handling empty columns.
updated tests and docs.
fixes #5391
Deprecate symmetrize! in favor of copytri!
Add pivoting to LU decomposition.
fix #5437
Improved implementation of random number generation within a range