Fix for certain TV shows not being discovered.

Are the status code checks and bozo_exception checks still needed? Anyway plugin.internet decorator that I added should take care of most internet related errors, correct?

They mess up with certain shows searches - they are being skipped because they get caught in both bozo and status code checks. (eg. The Blacklist, Sleepy Hollow).

Test scenario:

```yaml
tasks:
  KatTest:
    discover:
      what:
        - emit_series:
            from_start: yes
      from:
        - kat:
            category: tv
            verified: yes

    series:
      - The Blacklist:
          begin: S01E01
          quality: 720p hdtv
          set: {tvdb_id: '266189'}
```

When ran as

```flexget -c kattest.yaml --debug --test execute```

Output before fix:

```
2014-01-17 20:27 VERBOSE  discover      KatTest         Discovering 1 titles ...
2014-01-17 20:27 DEBUG    discover      KatTest         The Blacklist S01E01 -> No previous run recorded
2014-01-17 20:27 DEBUG    discover      KatTest         interval passed
2014-01-17 20:27 DEBUG    est_released  KatTest         The Blacklist S01E01
2014-01-17 20:27 DEBUG    est_movies    KatTest         Unable to check release for The Blacklist S01E01, tmdb_release field is not defined
2014-01-17 20:27 DEBUG    est_series    KatTest         Querying release estimation for The Blacklist S01E01 ...
2014-01-17 20:27 DEBUG    api_tvrage    KatTest         Fetching tvrage info for The Blacklist
2014-01-17 20:27 DEBUG    discover      KatTest         The Blacklist S01E01 has been released at 2013-09-23 00:00:00
2014-01-17 20:27 VERBOSE  discover      KatTest         Searching for `The Blacklist S01E01` (1 of 1)
2014-01-17 20:27 DEBUG    kat           KatTest         requesting: http://kickass.to/search/the%20blacklist%20s01e01%20verified%3A1/?rss=1&category=tv
2014-01-17 20:27 DEBUG    kat           KatTest         requesting: http://kickass.to/search/the%20blacklist%201x01%20verified%3A1/?rss=1&category=tv
2014-01-17 20:27 DEBUG    discover      KatTest         No results from kat: Search result not 200 (OK), received 404
2014-01-17 20:27 INFO     task          KatTest         Plugin discover has requested task to be ran again after execution has completed.
2014-01-17 20:27 VERBOSE  details       KatTest         Task didn't produce any entries.
```

After applying fix, the output is:

```
2014-01-17 20:31 VERBOSE  discover      KatTest         Discovering 1 titles ...
2014-01-17 20:31 DEBUG    discover      KatTest         The Blacklist S01E01 -> No previous run recorded
2014-01-17 20:31 DEBUG    discover      KatTest         interval passed
2014-01-17 20:31 DEBUG    est_released  KatTest         The Blacklist S01E01
2014-01-17 20:31 DEBUG    est_movies    KatTest         Unable to check release for The Blacklist S01E01, tmdb_release field is not defined
2014-01-17 20:31 DEBUG    est_series    KatTest         Querying release estimation for The Blacklist S01E01 ...
2014-01-17 20:31 DEBUG    api_tvrage    KatTest         Fetching tvrage info for The Blacklist
2014-01-17 20:31 DEBUG    discover      KatTest         The Blacklist S01E01 has been released at 2013-09-23 00:00:00
2014-01-17 20:31 VERBOSE  discover      KatTest         Searching for `The Blacklist S01E01` (1 of 1)
2014-01-17 20:31 DEBUG    kat           KatTest         requesting: http://kickass.to/search/the%20blacklist%20s01e01%20verified%3A1/?rss=1&category=tv
2014-01-17 20:31 DEBUG    kat           KatTest         requesting: http://kickass.to/search/the%20blacklist%201x01%20verified%3A1/?rss=1&category=tv
2014-01-17 20:31 DEBUG    discover      KatTest         Discovered 25 entries from kat
2014-01-17 20:31 VERBOSE  details       KatTest         Produced 25 entries.
```