Ignore Mac OS '.DS_Store' files.
Add Wget-only versions of all scripts

New files with with "-wget" appended to name are clones of originals,
modified to use the equivalent wget command. Functionality is identical for
each, but progress and file naming may be inconsistent compared to relative
Curl version.

**Notes on curl vs. wget:**

    curl -L
    wget --max-redirect=1000 --trust-server-names

    curl -s
    wget -q

    curl --user-agent 'Mozilla/5.0'
    wget -U 'Mozilla/5.0'

    wget -O-  # redirects to current stream. Curl seems to do this
              # by default

    curl -C -
    wget -c

    curl -#
    wget --progress=bar

    curl -f http://url.com
    wget http://url.com 2>&1

**Souces:**

[curl(1) Mac OS X Manual Page](https://developer.apple.com/library/mac/
documentation/Darwin/Reference/ManPages/man1/curl.1.html)
[wget-1.14 man page](ftp://ftp.connect.org.uk/hpux/Gnu/wget-1.14/wget-1.
14.man.html)
Add Wget and cURL support in the same script

Detect curl and wget installation status. If both curl and wget are
available, use curl; otherwise, use whichever is available. Echo status
message reporting user's curl/wget version once detected.

Rename 'soundcloud_curl.sh' => 'soundcloud-dl.sh' to reflect newfound
wget abilities.
Merge pull request #15 from thetateal/Wget-Integration

wget integration