Urlencode reservation ids

Currently, if a reservation name contains special characters for a URL,
the reservation URL won't work and we will get "Sorry, but the
reservation you are trying to use seems to be invalid or expired."

That's because sanitize_title_with_dashes urlencodes the data,
but all the request variables are automatically decoded and when we
compare them they don't match.
Don't sanitize reservations ids and tokens

sanitizer_text_field removes urlencoded %-based octets, which are
sometimes valuable information. In our case – we have token ids in
Cyrillic.
Fix some string and docs typos.
Merge pull request #71 from DrewAPicture/typo

Fix some string and docs typos.
Add an action and filter in to affect the tools menu tabs and pages.
Merge branch 'urlencode-reservation-id' of https://github.com/nb/camptix into 68
Update camptix-fr_FR.po
Add a 3.8 compatible icon. Props @field2
Add [camptix_stats] shortcode.
Merge pull request #73 from xibe/patch-1

Update camptix-fr_FR.po
Merge pull request #72 from mattonomics/master

Add an action and filter in to affect the tools menu tabs and pages.
Slovak language
Merge pull request #77 from wpsk/master

Add sk_SK (Slovak) localization. props johnnypea.
Update localization template
Regenerate sk_SK localization binary.

Commit cd96ff0e5055879414c9eea5bcc775602cb3fb46 accepted the .mo binary from a contributor, which is a potential security risk. The best practice is to only accept the .po file and generate the binary yourself before committing. This commit regenerates the .mo binary to make sure it's safe.
Terminate unterminated statements
Check if value is null before trying to use it.

When clearing the form, the value will be null and attempting to use it will generate an error.
Use HTTP 1.1 for requests to PayPal.

PayPal is now requiring HTTP 1.1 for sandbox requests, and will require it in production in a few months. HTTP 1.0 requests will result in 403 codes.

See http://wordpress.org/support/topic/sandbox-error-a-payment-error-has-occurred for more details.
Update localization template
Bump version to 1.4.1