Travis fix

[amatsuo]

To fix #134

It took quite a lot of trials and errors but the solution I ended up with is to update the version of gcc, g++ and gfortran to 5.

For some reason, RSpectra (or maybe RcppEigen) can't work with gcc-6 (Build 409, the build terminated because compilation of a package didn't finish within 4MB log-file limit), and I decided to update it to gcc-5.

[amatsuo]

The issue look like this:

• Travis default gcc for Ubuntu Trusty is 4.8.*
• ndjson (which StreamR depends) require > 4.9.* (see here)
• Some packages (probably RSpectra) needs <= 5.*

So, in the end, gcc/g++/gfortran-5 is the sweetspot (probably I could also try 4.9. ). For quanteda, everything works with the default 4.8..

[codecov-io]

Codecov Report

Merging #136 into master will decrease coverage by 5.27%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #136      +/-   ##
==========================================
- Coverage   85.81%   80.53%   -5.28%     
==========================================
  Files           8        8              
  Lines         585      524      -61     
==========================================
- Hits          502      422      -80     
- Misses         83      102      +19

Impacted Files	Coverage Δ
R/encoding.R	58.49% <0%> (-9.37%)	:arrow_down:
R/nexis.R	91.37% <0%> (-8.63%)	:arrow_down:
R/readtext.R	79.77% <0%> (-5.08%)	:arrow_down:
R/get-functions.R	68.5% <0%> (-4.16%)	:arrow_down:
R/utils.R	89.18% <0%> (-3.92%)	:arrow_down:
R/readtext_options.R	97.36% <0%> (-2.64%)	:arrow_down:

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